Question

Write a C program to convert a given integer to roman number.Roman numerals are represented by 7different symbols: I, V, X, L, C, D and M.Symbol ValueI 1V 5X 10L 50C 100D 500M 1000

Answer 1

Since we have different values for certain numbers, a simple solution is the one given below. Comments are added. It will print the Letter corresponding to the value and keep on decrementing the value of integer. this process will continue till n becomes 0.

#include <stdio.h>

int main()
{   
int num;

printf("Enter a number: ");
scanf("%d", &num);
  
while(num > 0)
{if (num >= 1000)
{
printf("M"); // M is 1000
num =num-1000;
}

else if (num >= 900) // CM is 900
{
printf("CM");
num =num-900;
}

else if (num >= 500) // D is 500
{   
printf("D");
num =num- 500;
}

else if (num >= 400) // CD is 400
{
printf("CD");
num =num- 400;
}

else if (num >= 100) // C is 100
{
printf("C");
num =num- 100;   
}

else if (num >= 90) // XC is 90
{
printf("XC");
num =num- 90;
}

else if (num >= 50) // L is 50
{
printf("L");
num = num-50;   
}

else if (num >= 40) // XL is 40
{
printf("XL");   
num =num- 40;
}

else if (num >= 10) // X is 10
{
printf("X");
num =num- 10;   
}

else if (num >= 9) // IX is 9
{
printf("IX");
num =num- 9;   
}

else if (num >= 5) // V is 5
{
printf("V");
num =num- 5;   
}

else if (num >= 4) // IV is 4
{
printf("IV");
num =num- 4;
}

else if (num >= 1) // I is 1
{
printf("I");
num =num-1;   
}

}

return 0;
}

O/p:

Enter a number: 234 CCXXXIV