C Program to Convert a Decimal Number to Roman Numerals

Write a C Program to Convert a Decimal Number to Roman Numerals

Program:

#include <stdio.h>

int main(void)
{  
    int num, rem;
   
    printf("Enter a number: ");
    scanf("%d", &num);
   
    printf("Roman numerals: ");       
   
    while(num != 0)
    {
   
        if (num >= 1000)       // 1000 - m
        {
           printf("m");
           num -= 1000;
        }

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

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

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

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

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

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

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

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

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

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

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

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

    return 0;
}
-----------------------------------------------------------------
Output:

Enter a number: 99
Roman numerals: xcix
--------------------------------
Process exited after 3.584 seconds with return value 0
Press any key to continue . . .