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Following this popular question, present your solution which prints the numbers 1 to 1000 (all of them, not the string "1 to 1000" verbatim or something funny) in C++ without using any semi-colons. Unlike the original question, you may use conditionals and loops.

Solutions not requiring any compiler flags are preferred. Please mention any you use if you go against this. Undefined behaviour is allowed, so please specify the compiler and version you're using. Preference will be given to clever solutions. This is not a shortest code contest.

(I have a solution, which I'll post in 24 hours if a similar solution isn't posted before then.)

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5  
what about your solution? –  Quixotic Mar 9 '11 at 0:15
    
@Deb The if condition in my statement evaluated to false. :) –  marcog Mar 10 '11 at 7:45
    
@macrog:May I know which of the solution makes that evaluation? :-) –  Quixotic Mar 10 '11 at 19:07
    
There is also a similar task in SPOJ which require you to code without semicolon. –  Quixotic Mar 10 '11 at 19:11
    
Y CAnt use constructors since the question actually wants us to answer in c++ ..create 1000 objects ...everytime constructor gets called i++ ?? :) –  user6974 Dec 12 '12 at 8:21

23 Answers 23

Since All you want is not shortening but tricks here is another one:

#define P1(i) if(printf("%d\n",i++)){}
#define P2(i) P1(i) P1(i)
#define P4(i) P2(i) P2(i)
#define P8(i) P4(i) P4(i)
#define P16(i) P8(i) P8(i)
#define P32(i) P16(i) P16(i)
#define P64(i) P32(i) P32(i)
#define P128(i) P64(i) P64(i)
#define P256(i) P128(i) P128(i)
#define P512(i) P256(i) P256(i)

main(i){P512(i) P256(i) P128(i) P64(i) P32(i) P8(i)}

Does this even works?

YES.

Why is this working?

Think about the binary representation of 1000.

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This is similar to this answer. –  muntoo Apr 30 '11 at 1:34
1  
+1 for the clever solution. –  Neil Jun 29 '11 at 16:06
3  
This isn't legal C++- it does not have default-int, you didn't include the header for printf, etc. –  DeadMG Jun 30 '11 at 15:23
main(){if(printf("1 2 3 4 5 6 7 8 9 10 11 12 13 14 15 16 17 18 19 20 21 22 23 24 25 26 27 28 29 30 31 32 33 34 35 36 37 38 39 40 41 42 43 44 45 46 47 48 49 50 51 52 53 54 55 56 57 58 59 60 61 62 63 64 65 66 67 68 69 70 71 72 73 74 75 76 77 78 79 80 81 82 83 84 85 86 87 88 89 90 91 92 93 94 95 96 97 98 99 100 101 102 103 104 105 106 107 108 109 110 111 112 113 114 115 116 117 118 119 120 121 122 123 124 125 126 127 128 129 130 131 132 133 134 135 136 137 138 139 140 141 142 143 144 145 146 147 148 149 150 151 152 153 154 155 156 157 158 159 160 161 162 163 164 165 166 167 168 169 170 171 172 173 174 175 176 177 178 179 180 181 182 183 184 185 186 187 188 189 190 191 192 193 194 195 196 197 198 199 200 201 202 203 204 205 206 207 208 209 210 211 212 213 214 215 216 217 218 219 220 221 222 223 224 225 226 227 228 229 230 231 232 233 234 235 236 237 238 239 240 241 242 243 244 245 246 247 248 249 250 251 252 253 254 255 256 257 258 259 260 261 262 263 264 265 266 267 268 269 270 271 272 273 274 275 276 277 278 279 280 281 282 283 284 285 286 287 288 289 290 291 292 293 294 295 296 297 298 299 300 301 302 303 304 305 306 307 308 309 310 311 312 313 314 315 316 317 318 319 320 321 322 323 324 325 326 327 328 329 330 331 332 333 334 335 336 337 338 339 340 341 342 343 344 345 346 347 348 349 350 351 352 353 354 355 356 357 358 359 360 361 362 363 364 365 366 367 368 369 370 371 372 373 374 375 376 377 378 379 380 381 382 383 384 385 386 387 388 389 390 391 392 393 394 395 396 397 398 399 400 401 402 403 404 405 406 407 408 409 410 411 412 413 414 415 416 417 418 419 420 421 422 423 424 425 426 427 428 429 430 431 432 433 434 435 436 437 438 439 440 441 442 443 444 445 446 447 448 449 450 451 452 453 454 455 456 457 458 459 460 461 462 463 464 465 466 467 468 469 470 471 472 473 474 475 476 477 478 479 480 481 482 483 484 485 486 487 488 489 490 491 492 493 494 495 496 497 498 499 500 501 502 503 504 505 506 507 508 509 510 511 512 513 514 515 516 517 518 519 520 521 522 523 524 525 526 527 528 529 530 531 532 533 534 535 536 537 538 539 540 541 542 543 544 545 546 547 548 549 550 551 552 553 554 555 556 557 558 559 560 561 562 563 564 565 566 567 568 569 570 571 572 573 574 575 576 577 578 579 580 581 582 583 584 585 586 587 588 589 590 591 592 593 594 595 596 597 598 599 600 601 602 603 604 605 606 607 608 609 610 611 612 613 614 615 616 617 618 619 620 621 622 623 624 625 626 627 628 629 630 631 632 633 634 635 636 637 638 639 640 641 642 643 644 645 646 647 648 649 650 651 652 653 654 655 656 657 658 659 660 661 662 663 664 665 666 667 668 669 670 671 672 673 674 675 676 677 678 679 680 681 682 683 684 685 686 687 688 689 690 691 692 693 694 695 696 697 698 699 700 701 702 703 704 705 706 707 708 709 710 711 712 713 714 715 716 717 718 719 720 721 722 723 724 725 726 727 728 729 730 731 732 733 734 735 736 737 738 739 740 741 742 743 744 745 746 747 748 749 750 751 752 753 754 755 756 757 758 759 760 761 762 763 764 765 766 767 768 769 770 771 772 773 774 775 776 777 778 779 780 781 782 783 784 785 786 787 788 789 790 791 792 793 794 795 796 797 798 799 800 801 802 803 804 805 806 807 808 809 810 811 812 813 814 815 816 817 818 819 820 821 822 823 824 825 826 827 828 829 830 831 832 833 834 835 836 837 838 839 840 841 842 843 844 845 846 847 848 849 850 851 852 853 854 855 856 857 858 859 860 861 862 863 864 865 866 867 868 869 870 871 872 873 874 875 876 877 878 879 880 881 882 883 884 885 886 887 888 889 890 891 892 893 894 895 896 897 898 899 900 901 902 903 904 905 906 907 908 909 910 911 912 913 914 915 916 917 918 919 920 921 922 923 924 925 926 927 928 929 930 931 932 933 934 935 936 937 938 939 940 941 942 943 944 945 946 947 948 949 950 951 952 953 954 955 956 957 958 959 960 961 962 963 964 965 966 967 968 969 970 971 972 973 974 975 976 977 978 979 980 981 982 983 984 985 986 987 988 989 990 991 992 993 994 995 996 997 998 999 1000")){}}
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3  
+1 for actually typing all that. –  John Jan 31 '11 at 3:01
5  
@John: He probably cut and pasted it. This isn't lines from your school. :-P :-P :-P –  Chris Jester-Young Jan 31 '11 at 4:40
    
@Chris: Good Point. :-P –  John Jan 31 '11 at 14:10
10  
I can't believe 4 people voted for this, this is wrong, prints till 999. –  st0le Feb 1 '11 at 5:31
1  
This is still wrong- main has no return type. –  DeadMG Jun 30 '11 at 15:04
#error "1 2 3 4 5 6 7 8 9 10 11 12 13 14 15 16 17 18 19 20 21 22 23 24 25 26 27 28 29 30 31 32 33 34 35 36 37 38 39 40 41 42 43 44 45 46 47 48 49 50 51 52 53 54 55 56 57 58 59 60 61 62 63 64 65 66 67 68 69 70 71 72 73 74 75 76 77 78 79 80 81 82 83 84 85 86 87 88 89 90 91 92 93 94 95 96 97 98 99 100 101 102 103 104 105 106 107 108 109 110 111 112 113 114 115 116 117 118 119 120 121 122 123 124 125 126 127 128 129 130 131 132 133 134 135 136 137 138 139 140 141 142 143 144 145 146 147 148 149 150 151 152 153 154 155 156 157 158 159 160 161 162 163 164 165 166 167 168 169 170 171 172 173 174 175 176 177 178 179 180 181 182 183 184 185 186 187 188 189 190 191 192 193 194 195 196 197 198 199 200 201 202 203 204 205 206 207 208 209 210 211 212 213 214 215 216 217 218 219 220 221 222 223 224 225 226 227 228 229 230 231 232 233 234 235 236 237 238 239 240 241 242 243 244 245 246 247 248 249 250 251 252 253 254 255 256 257 258 259 260 261 262 263 264 265 266 267 268 269 270 271 272 273 274 275 276 277 278 279 280 281 282 283 284 285 286 287 288 289 290 291 292 293 294 295 296 297 298 299 300 301 302 303 304 305 306 307 308 309 310 311 312 313 314 315 316 317 318 319 320 321 322 323 324 325 326 327 328 329 330 331 332 333 334 335 336 337 338 339 340 341 342 343 344 345 346 347 348 349 350 351 352 353 354 355 356 357 358 359 360 361 362 363 364 365 366 367 368 369 370 371 372 373 374 375 376 377 378 379 380 381 382 383 384 385 386 387 388 389 390 391 392 393 394 395 396 397 398 399 400 401 402 403 404 405 406 407 408 409 410 411 412 413 414 415 416 417 418 419 420 421 422 423 424 425 426 427 428 429 430 431 432 433 434 435 436 437 438 439 440 441 442 443 444 445 446 447 448 449 450 451 452 453 454 455 456 457 458 459 460 461 462 463 464 465 466 467 468 469 470 471 472 473 474 475 476 477 478 479 480 481 482 483 484 485 486 487 488 489 490 491 492 493 494 495 496 497 498 499 500 501 502 503 504 505 506 507 508 509 510 511 512 513 514 515 516 517 518 519 520 521 522 523 524 525 526 527 528 529 530 531 532 533 534 535 536 537 538 539 540 541 542 543 544 545 546 547 548 549 550 551 552 553 554 555 556 557 558 559 560 561 562 563 564 565 566 567 568 569 570 571 572 573 574 575 576 577 578 579 580 581 582 583 584 585 586 587 588 589 590 591 592 593 594 595 596 597 598 599 600 601 602 603 604 605 606 607 608 609 610 611 612 613 614 615 616 617 618 619 620 621 622 623 624 625 626 627 628 629 630 631 632 633 634 635 636 637 638 639 640 641 642 643 644 645 646 647 648 649 650 651 652 653 654 655 656 657 658 659 660 661 662 663 664 665 666 667 668 669 670 671 672 673 674 675 676 677 678 679 680 681 682 683 684 685 686 687 688 689 690 691 692 693 694 695 696 697 698 699 700 701 702 703 704 705 706 707 708 709 710 711 712 713 714 715 716 717 718 719 720 721 722 723 724 725 726 727 728 729 730 731 732 733 734 735 736 737 738 739 740 741 742 743 744 745 746 747 748 749 750 751 752 753 754 755 756 757 758 759 760 761 762 763 764 765 766 767 768 769 770 771 772 773 774 775 776 777 778 779 780 781 782 783 784 785 786 787 788 789 790 791 792 793 794 795 796 797 798 799 800 801 802 803 804 805 806 807 808 809 810 811 812 813 814 815 816 817 818 819 820 821 822 823 824 825 826 827 828 829 830 831 832 833 834 835 836 837 838 839 840 841 842 843 844 845 846 847 848 849 850 851 852 853 854 855 856 857 858 859 860 861 862 863 864 865 866 867 868 869 870 871 872 873 874 875 876 877 878 879 880 881 882 883 884 885 886 887 888 889 890 891 892 893 894 895 896 897 898 899 900 901 902 903 904 905 906 907 908 909 910 911 912 913 914 915 916 917 918 919 920 921 922 923 924 925 926 927 928 929 930 931 932 933 934 935 936 937 938 939 940 941 942 943 944 945 946 947 948 949 950 951 952 953 954 955 956 957 958 959 960 961 962 963 964 965 966 967 968 969 970 971 972 973 974 975 976 977 978 979 980 981 982 983 984 985 986 987 988 989 990 991 992 993 994 995 996 997 998 999 1000"
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2  
+1 Hadn't thought of doing that. That'll print to stderr, which makes me think: should it not be a rule that by default solutions have to output to stdout? No quibbering over this solution though. –  marcog Jan 30 '11 at 22:14
    
@marcog: I'd leave that up to the individual task. Some are ok with error output, some are not. In both cases there are ways to golf it. –  Joey Jan 31 '11 at 0:08
    
If you want stdout, it's not a huge leap to turn this into the obvious printf() –  gnibbler Jan 31 '11 at 0:59
    
The thing is, it's not the program that prints the numbers, it's the compiler. Who'll guarantee it's written in C++? –  J B Mar 8 '11 at 19:37
1  
This is the only even remotely correct answer. –  DeadMG Jun 30 '11 at 15:25

Here is a real solution:

Trick is that i is initialized with number of cl arguments, i.e. 1

main(i){
  while(printf("%d ", i), i++ < 1000) {}
}
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1  
That's a good trick. Get screwed if they call it as ./a.out 1 2 3 4 5 6 7 8 9 10 ;) –  jcolebrand Jan 31 '11 at 14:17
1  
you can always do if (i=1) {} –  Alexandru Jan 31 '11 at 14:27
    
This looks like a wrong answer, because the questions asks about a C++ solution. –  Johannes Schaub - litb Feb 7 '11 at 16:53
7  
@muntoo: It's not legal C++ at all. C++ does not have default-int. C++ is backwards compatible with C mostly, but they removed a few of the blindingly stupid things, like default-int. –  DeadMG Jun 30 '11 at 14:51
4  
@DeadMG: You can fix all those without semicolons; just change the first line to int main(int i, char * argv[]). –  Mechanical snail Oct 1 '11 at 23:08

Inspired by this answer.

main(){if(printf("1 10 11 100 101 110 111 1000"){}}
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+1 for a being a smartass programmer. –  Neil Jun 29 '11 at 16:09
1  
This code is not legal - main has no return type and you did not include the printf header. –  DeadMG Jun 30 '11 at 15:24
11  
You're missing a ). –  marinus Jul 10 '11 at 10:01
2  
@ValekHalfHeart: Who cares? This question is about C++. –  Lightness Races in Orbit Jun 4 at 16:57

Simple and almost idiomatic:

#include <iostream>

void loop(int low, int high)
{
  if ( low <= high                   &&
       std::cout << low << std::endl &&
       (loop(low+1, high), false) )
  {}
}

int main()
{
  if (loop(1, 1000), false) {}
}
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In the spirit of this answer, here's one that works in a slightly more generic fashion, generating the numbers at compile time using the __COUNTER__ extension provided by GCC and VC++. The C macro is a laughably half-assed attempt at brevity.

#define C __COUNTER__
main(){if(C||printf("%d %d %d %d %d %d %d %d %d %d %d %d %d %d %d %d %d %d %d %d %d %d %d %d %d %d %d %d %d %d %d %d %d %d %d %d %d %d %d %d %d %d %d %d %d %d %d %d %d %d %d %d %d %d %d %d %d %d %d %d %d %d %d %d %d %d %d %d %d %d %d %d %d %d %d %d %d %d %d %d %d %d %d %d %d %d %d %d %d %d %d %d %d %d %d %d %d %d %d %d %d %d %d %d %d %d %d %d %d %d %d %d %d %d %d %d %d %d %d %d %d %d %d %d %d %d %d %d %d %d %d %d %d %d %d %d %d %d %d %d %d %d %d %d %d %d %d %d %d %d %d %d %d %d %d %d %d %d %d %d %d %d %d %d %d %d %d %d %d %d %d %d %d %d %d %d %d %d %d %d %d %d %d %d %d %d %d %d %d %d %d %d %d %d %d %d %d %d %d %d %d %d %d %d %d %d %d %d %d %d %d %d %d %d %d %d %d %d %d %d %d %d %d %d %d %d %d %d %d %d %d %d %d %d %d %d %d %d %d %d %d %d %d %d %d %d %d %d %d %d %d %d %d %d %d %d %d %d %d %d %d %d %d %d %d %d %d %d %d %d %d %d %d %d %d %d %d %d %d %d %d %d %d %d %d %d %d %d %d %d %d %d %d %d %d %d %d %d %d %d %d %d %d %d %d %d %d %d %d %d %d %d %d %d %d %d %d %d %d %d %d %d %d %d %d %d %d %d %d %d %d %d %d %d %d %d %d %d %d %d %d %d %d %d %d %d %d %d %d %d %d %d %d %d %d %d %d %d %d %d %d %d %d %d %d %d %d %d %d %d %d %d %d %d %d %d %d %d %d %d %d %d %d %d %d %d %d %d %d %d %d %d %d %d %d %d %d %d %d %d %d %d %d %d %d %d %d %d %d %d %d %d %d %d %d %d %d %d %d %d %d %d %d %d %d %d %d %d %d %d %d %d %d %d %d %d %d %d %d %d %d %d %d %d %d %d %d %d %d %d %d %d %d %d %d %d %d %d %d %d %d %d %d %d %d %d %d %d %d %d %d %d %d %d %d %d %d %d %d %d %d %d %d %d %d %d %d %d %d %d %d %d %d %d %d %d %d %d %d %d %d %d %d %d %d %d %d %d %d %d %d %d %d %d %d %d %d %d %d %d %d %d %d %d %d %d %d %d %d %d %d %d %d %d %d %d %d %d %d %d %d %d %d %d %d %d %d %d %d %d %d %d %d %d %d %d %d %d %d %d %d %d %d %d %d %d %d %d %d %d %d %d %d %d %d %d %d %d %d %d %d %d %d %d %d %d %d %d %d %d %d %d %d %d %d %d %d %d %d %d %d %d %d %d %d %d %d %d %d %d %d %d %d %d %d %d %d %d %d %d %d %d %d %d %d %d %d %d %d %d %d %d %d %d %d %d %d %d %d %d %d %d %d %d %d %d %d %d %d %d %d %d %d %d %d %d %d %d %d %d %d %d %d %d %d %d %d %d %d %d %d %d %d %d %d %d %d %d %d %d %d %d %d %d %d %d %d %d %d %d %d %d %d %d %d %d %d %d %d %d %d %d %d %d %d %d %d %d %d %d %d %d %d %d %d %d %d %d %d %d %d %d %d %d %d %d %d %d %d %d %d %d %d %d %d %d %d %d %d %d %d %d %d %d %d %d %d %d %d %d %d %d %d %d %d %d %d %d %d %d %d %d %d %d %d %d %d %d %d %d %d %d %d %d %d %d %d %d %d %d %d %d %d %d %d %d %d %d %d %d %d %d %d %d %d %d %d %d %d %d %d %d %d %d %d %d %d %d %d %d %d %d %d %d %d %d %d %d %d %d %d %d %d %d %d %d %d %d %d %d %d %d %d %d %d %d %d %d %d %d %d %d %d %d %d %d %d %d %d %d %d %d %d %d %d %d %d %d %d %d %d %d %d %d %d %d %d %d %d %d %d %d %d %d %d %d %d %d %d %d %d %d %d %d %d %d %d %d %d %d %d %d %d %d %d %d %d %d %d %d %d %d %d %d %d %d %d %d %d %d %d %d %d %d %d %d %d %d %d %d %d %d %d %d %d %d %d %d %d %d %d %d %d %d %d %d %d %d %d %d %d %d %d %d %d %d %d %d %d %d %d %d %d %d %d %d %d %d %d %d %d %d %d %d %d %d %d %d %d %d %d %d %d %d %d %d %d %d %d %d %d %d %d %d %d %d %d %d %d %d %d %d %d %d %d %d %d %d %d %d\n",C,C,C,C,C,C,C,C,C,C,C,C,C,C,C,C,C,C,C,C,C,C,C,C,C,C,C,C,C,C,C,C,C,C,C,C,C,C,C,C,C,C,C,C,C,C,C,C,C,C,C,C,C,C,C,C,C,C,C,C,C,C,C,C,C,C,C,C,C,C,C,C,C,C,C,C,C,C,C,C,C,C,C,C,C,C,C,C,C,C,C,C,C,C,C,C,C,C,C,C,C,C,C,C,C,C,C,C,C,C,C,C,C,C,C,C,C,C,C,C,C,C,C,C,C,C,C,C,C,C,C,C,C,C,C,C,C,C,C,C,C,C,C,C,C,C,C,C,C,C,C,C,C,C,C,C,C,C,C,C,C,C,C,C,C,C,C,C,C,C,C,C,C,C,C,C,C,C,C,C,C,C,C,C,C,C,C,C,C,C,C,C,C,C,C,C,C,C,C,C,C,C,C,C,C,C,C,C,C,C,C,C,C,C,C,C,C,C,C,C,C,C,C,C,C,C,C,C,C,C,C,C,C,C,C,C,C,C,C,C,C,C,C,C,C,C,C,C,C,C,C,C,C,C,C,C,C,C,C,C,C,C,C,C,C,C,C,C,C,C,C,C,C,C,C,C,C,C,C,C,C,C,C,C,C,C,C,C,C,C,C,C,C,C,C,C,C,C,C,C,C,C,C,C,C,C,C,C,C,C,C,C,C,C,C,C,C,C,C,C,C,C,C,C,C,C,C,C,C,C,C,C,C,C,C,C,C,C,C,C,C,C,C,C,C,C,C,C,C,C,C,C,C,C,C,C,C,C,C,C,C,C,C,C,C,C,C,C,C,C,C,C,C,C,C,C,C,C,C,C,C,C,C,C,C,C,C,C,C,C,C,C,C,C,C,C,C,C,C,C,C,C,C,C,C,C,C,C,C,C,C,C,C,C,C,C,C,C,C,C,C,C,C,C,C,C,C,C,C,C,C,C,C,C,C,C,C,C,C,C,C,C,C,C,C,C,C,C,C,C,C,C,C,C,C,C,C,C,C,C,C,C,C,C,C,C,C,C,C,C,C,C,C,C,C,C,C,C,C,C,C,C,C,C,C,C,C,C,C,C,C,C,C,C,C,C,C,C,C,C,C,C,C,C,C,C,C,C,C,C,C,C,C,C,C,C,C,C,C,C,C,C,C,C,C,C,C,C,C,C,C,C,C,C,C,C,C,C,C,C,C,C,C,C,C,C,C,C,C,C,C,C,C,C,C,C,C,C,C,C,C,C,C,C,C,C,C,C,C,C,C,C,C,C,C,C,C,C,C,C,C,C,C,C,C,C,C,C,C,C,C,C,C,C,C,C,C,C,C,C,C,C,C,C,C,C,C,C,C,C,C,C,C,C,C,C,C,C,C,C,C,C,C,C,C,C,C,C,C,C,C,C,C,C,C,C,C,C,C,C,C,C,C,C,C,C,C,C,C,C,C,C,C,C,C,C,C,C,C,C,C,C,C,C,C,C,C,C,C,C,C,C,C,C,C,C,C,C,C,C,C,C,C,C,C,C,C,C,C,C,C,C,C,C,C,C,C,C,C,C,C,C,C,C,C,C,C,C,C,C,C,C,C,C,C,C,C,C,C,C,C,C,C,C,C,C,C,C,C,C,C,C,C,C,C,C,C,C,C,C,C,C,C,C,C,C,C,C,C,C,C,C,C,C,C,C,C,C,C,C,C,C,C,C,C,C,C,C,C,C,C,C,C,C,C,C,C,C,C,C,C,C,C,C,C,C,C,C,C,C,C,C,C,C,C,C,C,C,C,C,C,C,C,C,C,C,C,C,C,C,C,C,C,C,C,C,C,C,C,C,C,C,C,C,C,C,C,C,C,C,C,C,C,C,C,C,C,C,C,C,C,C,C,C,C,C,C,C,C,C,C,C,C,C,C,C,C,C,C,C,C,C,C,C,C,C,C,C,C,C,C,C,C,C,C,C,C,C,C,C,C,C,C,C,C,C,C,C,C,C,C,C,C,C,C,C,C,C,C,C,C,C,C,C,C,C,C,C,C,C,C,C,C,C,C,C,C,C,C,C,C,C,C,C,C,C,C,C,C,C,C,C,C,C,C,C,C,C,C,C,C,C,C,C,C,C,C,C,C,C,C,C,C,C,C,C,C,C,C,C,C,C,C,C,C,C,C,C,C,C,C,C,C,C,C,C,C,C,C,C,C,C,C,C,C,C,C,C,C,C,C,C,C,C,C,C,C,C,C,C)){}}

(Note: runs on ideone but not codepad.)

share|improve this answer
1  
This has no return type, and did not include the printf header. –  DeadMG Jun 30 '11 at 15:24
    
@DeadMG: What, were you under the impression I was unaware? –  Jon Purdy Jun 30 '11 at 20:45
1  
@JonPurdy: I guess he was under the mistaken impression that you'd care that your answer is not valid C++ and thus a wrong answer. –  Lightness Races in Orbit Jun 4 at 16:58

The semicolon is not needed if you know the magic word. And no need to go obfuscated.

My solution has the additional fanciness that it doesn't use any comma either ;)

#include <iostream>
#define Please(x) if (x) {}

int Number(int x)
{
    if (x > 1)
        Please(Number(x-1))
    Please(std::cout << " " << x)
}

int main()
{
    Please(Number(1000))
}
share|improve this answer
#include <stdio.h>
#include <stdlib.h>
#include <unistd.h>
int main(void) {
    if (char *p = (char *) malloc(10000U)) {
        if (__LINE__ < 106 && printf("%d\n", __LINE__ - 5)) {
            if (FILE *fp = fopen(__FILE__ ".tmp", "w")) {
                if (putc('\n', fp) &&
                    fwrite(p, 1U,
                           fread(p, 1U, 10000U, fopen(__FILE__, "r")), fp) &&
                    fclose(fp) ||
                    rename(__FILE__ ".tmp", __FILE__) ||
                    system("g++ " __FILE__ " && exec ./a.out")) {
                }
            }
        }
    }
}
share|improve this answer
    
Ouch, painful.. Why even use a file? –  Neil Jun 29 '11 at 16:06

Another Trick

main(i){if(printf("%d ",i),i<1000&&main(i+1)){}}
share|improve this answer
    
Uh, your answer has a semicolon in it. –  Chris Jester-Young Feb 4 '11 at 6:20
    
@chris-jester-young How about now? –  fR0DDY Feb 4 '11 at 6:30
    
Now we're talking. :-) –  Chris Jester-Young Feb 4 '11 at 12:57

Very similar to other solutions, but with a minor variation: The step variable is declared in the if condition:

#include <iostream>

int main(){
if (int x = 1)
    while (x <= 1000 && std::cout << x++ << std::endl) {}
}
share|improve this answer
    
You ain't returning an int... –  Vercas Jul 9 '11 at 11:32
1  
@Vercas: Undefined behavior is allowed here :) –  Jack Oct 10 '12 at 1:48
1  
@Vercas, main() has implicit return 0; in C++. –  Griwes Dec 23 '12 at 10:34
    
+1 for clear standard code –  Cheers and hth. - Alf Dec 23 '12 at 11:09
#include <iostream>

void main()
{
   if (int i = 1)
   {
      while (std::cout << i << std::endl, i++ < 1000) {}
   }
}
share|improve this answer
1  
wheres the i coming from? –  rubber boots Mar 9 '11 at 9:34
    
Fixed and compiled with dmc. –  Michael Mar 9 '11 at 13:56
    
main returns int, always –  Lightness Races in Orbit Jun 4 at 16:59

This works great on my Linux machine:

#include <cstdlib>

int main()
{
    if (system("seq 1 1000")){}
}

I know, I know, ...it's not portable.

share|improve this answer

Almost any regular-looking program can do, (no compiler specification necessary), like:

#include <stdio.h>
 void main(int argc, char*argv[]) 
{
if(argc=1000)
   while(argc-- && printf("%d ",1000-argc)) {}
}

can be formulated with C++ iostream in many different ways:

 #include <iostream>
 void main(int argc, char*argv[]) 
{
 if( ! (argc ^= argc) ) 
    while( argc++<1000 && std::cout.operator<<(argc) ) { 

    }
}
share|improve this answer
    
main returns int, always. –  Lightness Races in Orbit Jun 4 at 16:58

A fun one!

#include <stdio.h>

int main(int argc, char * argv[]) {
        if(argc == 0) {
             // Not enough arguments passed to my program! *Gasp*
             // Let's exit.
        } else if(argc == 1001) {
             // Why is someone passing 1001 arguments?
             // It's probably a hacker! Blocked, anyways...
             // (I don't know how to report these kinds
             // of things using C++, it's difficult...)
        } else if(!printf("%d\n", argc)) {
             // What???! There was an error printing the number
             // of arguments! That's a serious problem.
             // We can't let the user continue like this.
             // TODO: Exit the program
        } else if(main((argc++, argc), argv)) {
             // I'm doing this because I love writing "c++" in C++.
             // It's a lot of fun. And I love "argc" too.
             // You can see it in the "argc++, argc". Just imagine
             // it as singing... ~arg SEE plus pluhss! arg see...~
             // We'll never get here so I can do whatever I want.
             // I choose to write stupid comments and meaningless
             // preprocessor statements, because that's the way I am.
             #define happy "yes!"
             #define used recursion "yes!"
             #define is misusing define statements "yes!"
             #define included c++? "YES!!!"
        }
}

http://ideone.com/duRhQ

Yes, something like it has already been posted. But I would have done this anyways.

share|improve this answer
2  
This is not C++. It is illegal to call main recursively. –  Mankarse Jun 29 '11 at 0:47
    
@Mankarse: It works in Ideone. It doesn't matter. –  minitech Jun 29 '11 at 2:19
    
@Mankarse On this site, anything goes ;) –  professorfish Jun 5 at 14:10
#include <stdio.h>
#include <stdlib.h>

int main()
{
    while(errno++ < 1000 && printf("%d ", errno)){}
}
share|improve this answer
#include <fstream>
#include <stdlib.h>

static int write_code(std::string str, std::ofstream out = std::ofstream())
{
    if (((
        out.open("my-thousand-tmp.cpp"),
        out) << str,
        out).close(),
        system("g++ -Wall -W -O3 my-thousand-tmp.cpp && exec ./a.out")
    ) {}

}

static int add_semicolons(std::string str, size_t i = 0)
{
    while (i < str.size())
        if (str[i++] == ':' && str[i-1]++) {}
    if (write_code(str)) {}
}

int main()
{
    if (add_semicolons(
        "#include <iostream>\n"
        "using namespace std:\n"
        "\n"
        "int main()\n"
        "{\n"
        "\tfor (int i = 1: i <= 1000: i++)\n"
        "\t\tcout << i << endl:\n"
        "\treturn 0:\n"
        "}\n"
    )) {}
}

I tried to initialize std::ofstream out by passing it as a parameter (i.e. write_code(str, std::ofstream()) ), but apparently, the copy constructor is private, and an expression like this can't be passed by reference.

share|improve this answer
#include <stdio.h>
#define __INTMAX_TYPE__ struct C { C(int x) { if (x == 1001?(puts(""),true):(printf("%d ",x),C(x+1),false)) {} } }
#include <stdint.h>
main(){if(intmax_t(1),false){}}
share|improve this answer

Without loops :)

main(i) {
  if(printf("%d\n", i) && i++ != 1000 && main(i)) { }
}

updated code:

#include <stdio.h>
#include <stdlib.h>

#define eval(c) if(c) { }       
#define close_app(c) (exit(c), c)
#define print_num(n) printf("%d\n", i)

inline loop(i, end, r) {
   eval((r = print_num(i)))

   if(r < 0)
     eval(close_app(1)) 
   if(i++ == end)
     eval(close_app(0))

     eval(start_loop(i))
}

inline start_loop(i) {
  eval(loop(i, 1000))
}

main(i) {
  eval(i = 1)
  eval(start_loop(i))
}

changes:

1) it works on clang compiler too;

2) independent of number of command-line-arguments, it print from 1 to 1000.

compile-run command:

gcc dead.c && ./a.out

(the program must be called without arguments)

Compiler that I have tested it:

gcc version 4.6.2 (SUSE Linux) 
pcc 1.0.0.RELEASE 20110221 for i586-suse-linux-gnu
tcc version 0.9.25
clang version 3.0 (branches/release_30 145598)
share|improve this answer

C++11 based solution using a lambda function:

/* golf.cpp */
#include <iostream>

int main() {
    if( [] (int from, int to) -> bool {
        while(std::cout << from << " " && ++from <= to
            || std::cout << std::endl && false) {}
    } (1, 1000) ) {}
}

Compiles and works:

$ g++ --version | head -n1
g++ (GCC) 4.8.2 20131017 (Red Hat 4.8.2-1)
...
$ g++ -std=c++11 golf.cpp -o golf
$ ./golf

Bonus 1: Adjusting the range to be printed is as easy as editing the two parameters of the call.

Bonus 2: Output terminated by a new line.

share|improve this answer

Your run-o'-the-mill recursion-based answer.

#include <iostream>

int main(int i, char *k[]) {
    if(
        k != NULL && (
            i = 0
        ),
        std::cout << i << ' ',
        i < 1e3 &&
            main(i + 1, NULL)
    ) {}
}
share|improve this answer

C++ with templates

#include <stdio.h>
#include <stdlib.h>

template<int THOU> void f() { while (printf("%d\n", THOU), f<THOU+1>(), 0) {} }
template<> void f<1001>() { while(exit(0), 0) {} }
int main()
{
    while (f<1>(), 0) {}
}

Notes:

  • Linux version 3.2.0-58-generic (buildd@allspice) (gcc version 4.6.3 (Ubuntu/Linaro 4.6.3-1ubuntu5) ) #88-Ubuntu SMP Tue Dec 3 17:37:58 UTC 2013
  • 64 bit (amd64) version of Kubuntu
share|improve this answer
int main(int i)
{
while(printf("%d ",i) && i<=1000 && i++){}
}
share|improve this answer

protected by Timtech Jun 5 at 15:15

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