Skip to main content
Code Golf

Return to Question

Commonmark migration
Source Link
Community Bot
Community Bot
  • 1

Challenge

###Challenge GivenGiven some input string, return a truthy value if it represents a correct roman numeral between 1 (=I) and 3999 (=MMMCMXCIX), and a falsey value otherwise.

###Details

Details

  • The input is a non-empty string that only comprises the characters IVXLCDM.
  • The roman numerals (that we use here in this challenge) are defined as follows:

We use only following symbols:

Symbol  I   V   X   L   C   D    M
Value   1   5  10  50 100 500 1000

To define which strings are actually valid roman numerals, it is probably easiest to provide the rule of conversation: To write a decimal number a3 a2 a1 a0 (where each ai represents one digit. So for example to represent 792 we have a3=0, a2=7, a1=9, a0=2.) as a roman numeral, we decompose it into the power of tens. The different powers of ten can be written as follows:

      1-9: I, II, III, IV, V, VI, VII, VIII, IX
    10-90: X, XX, XXX, XL, L, LX, LXX, LXXX, XC
  100-900: C, CC, CCC, CD, D, DC, DCC, DCCC, CM
1000-3000: M, MM, MMM

Beginning at the left side with the most significant digit of the, we can convert the number that each digit represents separately and concatenate them. So for the example from above this would look like so:

Digit        a3    a2   a1   a0
Decimal       0     7    9    2
Roman             DCC   XC   II

Therefore the roman numeral for 792 is DCCXCII. Here is a full list of all roman numerals that are relevant for this challenge: OEIS a006968.txt

Examples

###Examples Truthy

MCCXXXIV (1234)
CMLXXXVIII (988)
DXIV (514)
CI (101)

Falsey

MMIXVIII
IVX
IXV
MMMM
XXXVX
IVI
VIV

###Challenge Given some input string, return a truthy value if it represents a correct roman numeral between 1 (=I) and 3999 (=MMMCMXCIX), and a falsey value otherwise.

###Details

  • The input is a non-empty string that only comprises the characters IVXLCDM.
  • The roman numerals (that we use here in this challenge) are defined as follows:

We use only following symbols:

Symbol  I   V   X   L   C   D    M
Value   1   5  10  50 100 500 1000

To define which strings are actually valid roman numerals, it is probably easiest to provide the rule of conversation: To write a decimal number a3 a2 a1 a0 (where each ai represents one digit. So for example to represent 792 we have a3=0, a2=7, a1=9, a0=2.) as a roman numeral, we decompose it into the power of tens. The different powers of ten can be written as follows:

      1-9: I, II, III, IV, V, VI, VII, VIII, IX
    10-90: X, XX, XXX, XL, L, LX, LXX, LXXX, XC
  100-900: C, CC, CCC, CD, D, DC, DCC, DCCC, CM
1000-3000: M, MM, MMM

Beginning at the left side with the most significant digit of the, we can convert the number that each digit represents separately and concatenate them. So for the example from above this would look like so:

Digit        a3    a2   a1   a0
Decimal       0     7    9    2
Roman             DCC   XC   II

Therefore the roman numeral for 792 is DCCXCII. Here is a full list of all roman numerals that are relevant for this challenge: OEIS a006968.txt

###Examples Truthy

MCCXXXIV (1234)
CMLXXXVIII (988)
DXIV (514)
CI (101)

Falsey

MMIXVIII
IVX
IXV
MMMM
XXXVX
IVI
VIV

Challenge

Given some input string, return a truthy value if it represents a correct roman numeral between 1 (=I) and 3999 (=MMMCMXCIX), and a falsey value otherwise.

Details

  • The input is a non-empty string that only comprises the characters IVXLCDM.
  • The roman numerals (that we use here in this challenge) are defined as follows:

We use only following symbols:

Symbol  I   V   X   L   C   D    M
Value   1   5  10  50 100 500 1000

To define which strings are actually valid roman numerals, it is probably easiest to provide the rule of conversation: To write a decimal number a3 a2 a1 a0 (where each ai represents one digit. So for example to represent 792 we have a3=0, a2=7, a1=9, a0=2.) as a roman numeral, we decompose it into the power of tens. The different powers of ten can be written as follows:

      1-9: I, II, III, IV, V, VI, VII, VIII, IX
    10-90: X, XX, XXX, XL, L, LX, LXX, LXXX, XC
  100-900: C, CC, CCC, CD, D, DC, DCC, DCCC, CM
1000-3000: M, MM, MMM

Beginning at the left side with the most significant digit of the, we can convert the number that each digit represents separately and concatenate them. So for the example from above this would look like so:

Digit        a3    a2   a1   a0
Decimal       0     7    9    2
Roman             DCC   XC   II

Therefore the roman numeral for 792 is DCCXCII. Here is a full list of all roman numerals that are relevant for this challenge: OEIS a006968.txt

Examples

Truthy

MCCXXXIV (1234)
CMLXXXVIII (988)
DXIV (514)
CI (101)

Falsey

MMIXVIII
IVX
IXV
MMMM
XXXVX
IVI
VIV
Tweeted twitter.com/StackCodeGolf/status/1116672458659176453
added 9 characters in body
Source Link
flawr
flawr
  • 43.9k
  • 7
  • 104
  • 249

###Challenge Given some input string, return a truthy value if it represents a correct roman numeral between 1 (=I) and 3999 (=MMMCMXCIX), and a falsey value otherwise.

###Details

  • The input is a non-empty string that only comprises the characters IVXLCDM.
  • The roman numerals (that we use here in this challenge) are defined as follows:

We use only following symbols:

Symbol  I   V   X   L   C   D    M
Value   1   5  10  50 100 500 1000

To define which strings are actually valid roman numerals, it is probably easiest to provide the rule of conversation: To write a decimal number a3 a2 a1 a0 (where each ai represents one digit. So for example to represent 792 we have a3=0, a2=7, a1=9, a0=2.) as a roman numeral, we decompose it into the power of tens. The different powers of ten can be written as follows:

      1-9: I, II, III, IV, V, VI, VII, VIII, IX
    10-90: X, XX, XXX, XL, L, LX, LXX, LXXX, XC
  100-900: C, CC, CCC, CD, D, DC, DCC, DCCC, CM
1000-3000: M, MM, MMM

Beginning at the left side with the most significant digit of the, we can convert the number that each digit represents separately and concatenate them. So for the example from above this would look like so:

Digit        a3    a2   a1   a0
Decimal       0     7    9    2
Roman             DCC   XC   II

Therefore the roman numeral for 792 is DCCXCII. Here is a full list of all roman numerals that are relevant for this challenge: OEIS a006968.txt

###Examples Truthy

MCCXXXIV (1234)
CMLXXXVIII (988)
DXIV (514)
CI (101)

Falsey

MMIXVIII
IVX
IXV
MMMM
XXXVX
IVI
VIV

###Challenge Given some input string, return a truthy value if it represents a correct roman numeral between 1 (=I) and 3999 (=MMMCMXCIX), and a falsey value otherwise.

###Details

  • The input is a non-empty string that only comprises the characters IVXLCDM.
  • The roman numerals (that we use here in this challenge) are defined as follows:

We use only following symbols:

Symbol  I   V   X   L   C   D    M
Value   1   5  10  50 100 500 1000

To define which strings are actually valid roman numerals, it is probably easiest to provide the rule of conversation: To write a decimal number a3 a2 a1 a0 (where each ai represents one digit. So for example to represent 792 we have a3=0, a2=7, a1=9, a0=2.) as a roman numeral, we decompose it into the power of tens. The different powers of ten can be written as follows:

      1-9: I, II, III, IV, V, VI, VII, VIII, IX
    10-90: X, XX, XXX, XL, L, LX, LXX, LXXX, XC
  100-900: C, CC, CCC, CD, D, DC, DCC, DCCC, CM
1000-3000: M, MM, MMM

Beginning at the left side with the most significant digit of the, we can convert the number that each digit represents separately and concatenate them. So for the example from above this would look like so:

Digit        a3    a2   a1   a0
Decimal       0     7    9    2
Roman             DCC   XC   II

Therefore the roman numeral for 792 is DCCXCII. Here is a full list of all roman numerals that are relevant for this challenge: OEIS a006968.txt

###Examples Truthy

MCCXXXIV (1234)
CMLXXXVIII (988)
DXIV (514)
CI (101)

Falsey

MMIXVIII
IVX
IXV
MMMM
XXXVX
IVI

###Challenge Given some input string, return a truthy value if it represents a correct roman numeral between 1 (=I) and 3999 (=MMMCMXCIX), and a falsey value otherwise.

###Details

  • The input is a non-empty string that only comprises the characters IVXLCDM.
  • The roman numerals (that we use here in this challenge) are defined as follows:

We use only following symbols:

Symbol  I   V   X   L   C   D    M
Value   1   5  10  50 100 500 1000

To define which strings are actually valid roman numerals, it is probably easiest to provide the rule of conversation: To write a decimal number a3 a2 a1 a0 (where each ai represents one digit. So for example to represent 792 we have a3=0, a2=7, a1=9, a0=2.) as a roman numeral, we decompose it into the power of tens. The different powers of ten can be written as follows:

      1-9: I, II, III, IV, V, VI, VII, VIII, IX
    10-90: X, XX, XXX, XL, L, LX, LXX, LXXX, XC
  100-900: C, CC, CCC, CD, D, DC, DCC, DCCC, CM
1000-3000: M, MM, MMM

Beginning at the left side with the most significant digit of the, we can convert the number that each digit represents separately and concatenate them. So for the example from above this would look like so:

Digit        a3    a2   a1   a0
Decimal       0     7    9    2
Roman             DCC   XC   II

Therefore the roman numeral for 792 is DCCXCII. Here is a full list of all roman numerals that are relevant for this challenge: OEIS a006968.txt

###Examples Truthy

MCCXXXIV (1234)
CMLXXXVIII (988)
DXIV (514)
CI (101)

Falsey

MMIXVIII
IVX
IXV
MMMM
XXXVX
IVI
VIV
Became Hot Network Question
Source Link
flawr
flawr
  • 43.9k
  • 7
  • 104
  • 249

Match Roman Numerals

###Challenge Given some input string, return a truthy value if it represents a correct roman numeral between 1 (=I) and 3999 (=MMMCMXCIX), and a falsey value otherwise.

###Details

  • The input is a non-empty string that only comprises the characters IVXLCDM.
  • The roman numerals (that we use here in this challenge) are defined as follows:

We use only following symbols:

Symbol  I   V   X   L   C   D    M
Value   1   5  10  50 100 500 1000

To define which strings are actually valid roman numerals, it is probably easiest to provide the rule of conversation: To write a decimal number a3 a2 a1 a0 (where each ai represents one digit. So for example to represent 792 we have a3=0, a2=7, a1=9, a0=2.) as a roman numeral, we decompose it into the power of tens. The different powers of ten can be written as follows:

      1-9: I, II, III, IV, V, VI, VII, VIII, IX
    10-90: X, XX, XXX, XL, L, LX, LXX, LXXX, XC
  100-900: C, CC, CCC, CD, D, DC, DCC, DCCC, CM
1000-3000: M, MM, MMM

Beginning at the left side with the most significant digit of the, we can convert the number that each digit represents separately and concatenate them. So for the example from above this would look like so:

Digit        a3    a2   a1   a0
Decimal       0     7    9    2
Roman             DCC   XC   II

Therefore the roman numeral for 792 is DCCXCII. Here is a full list of all roman numerals that are relevant for this challenge: OEIS a006968.txt

###Examples Truthy

MCCXXXIV (1234)
CMLXXXVIII (988)
DXIV (514)
CI (101)

Falsey

MMIXVIII
IVX
IXV
MMMM
XXXVX
IVI