# Multiply two numbers

Input: Two decimal integers. These can be given to the code in standard input, as arguments to the program or function, or as a list.

Output: Their product, as a decimal integer. For example, the input 5 16 would lead to the output 80.

Restrictions: No standard loopholes please. This is , answer in lowest amount of bytes wins.

Notes: Layout stolen from my earlier challenge, Add two numbers.

Test cases:

1 2   -> 2
4 5   -> 20
7 9   -> 63
-2 8  -> -16
8 -9  -> -72
-8 -9 -> 72
0 8   -> 0
0 -8  -> 0
8 0   -> 0
-8 0  -> 0
0 0   -> 0


Or as CSV:

a,b,c
1,2,2
4,5,20
7,9,63
-2,8,-16
8,-9,-72
-8,-9,72
0,8,0
0,-8,0
8,0,0
-8,0,0
0,0,0


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• @FlipTack That's assuming addition and multiplication are as easy in any language, which I don't know if it's actually true. – Fatalize Jan 9 '17 at 8:13
• I don't think it's fair to allow the "add two numbers" challenge but close this one. Even though it's very trivial in most programming languages, it's still a valid challenge. If this is too broad, then the "add two numbers" challenge must also be too broad. – Mego Jan 9 '17 at 8:42
• Anyone is free to downvote trivial challenges if they don't like them, but this is a perfectly valid and on-topic challenge and it's nowhere near "too broad" (if anything, you might call a trivial challenge too narrow). I'm reopening this. That said, if anyone feels that trivial challenges insult their intelligence, I encourage them to seek out languages that make the task less trivial. – Martin Ender Jan 9 '17 at 9:19
• Uo next: Subtract two numbers! – steenbergh Jan 9 '17 at 12:57
• @wat Leaving no barrel-bottom unscraped, eh? – Gareth Jan 10 '17 at 12:39

# brainfuck, 29 bytes

,<,[>[>+>+<<-]>[<+>-]<<-]>>>.


Try it online!

Input and output as character codes. (Example: 5*7=35)

Code:

[Tape: Y, X, temp, solution]
,<,             input X and Y
[               while Y greater than 0
>[>+>+<<-]    add X to temp and solution
>[<+>-]       move temp back to X
<<-           decrement Y
]
>>>.            print solution


# Ruby, 10 bytes

->a,b{a*b}


and it would be great to learn if it is possible with fewer bytes

• codegolf.stackexchange.com/a/106314/53551 – dkudriavtsev May 16 '17 at 17:46
• haven't seen that – marmeladze May 16 '17 at 18:46
• should I supposed to delete/change on such cases? as you see, i am new here, and do not know, "rules of fight club" -)) – marmeladze May 16 '17 at 19:30
• – dkudriavtsev May 16 '17 at 19:31
• Duplicate answers are allowed, though they might attract downvotes. – HyperNeutrino Oct 6 '17 at 20:51