num_to_romanNum.c

/*            M = 1000
              CM = 900
              D= 500
              CD= 400
              C = 100
	      XC = 90
              L = 50
              XL = 40
              X = 10
              IX = 9
              V = 5
              IV = 4
              I = 1
*/
# include <stdio.h> 

int main(void)
{
    int num; 
    
    printf("Scan in a number to be converted to a roman number\n");
    scanf("%d", &num);
    
    while(num > 0)
    {
              if(num >= 1000)
              {
                     printf("M");
                     num-=1000;
              }
              else if(num >= 900)
              {
                   printf("CM");
                   num-=900;
              }
              else if(num >= 500)
              {
                   printf("D");
                   num-=500;
              }
              else if(num >= 400)
              {
                   printf("CD");
                   num-=400;
              }
              else if(num >= 100)
              {
                   printf("C");
                   num-=100;
              }
              else if(num >= 90){
              	   printf("XC");
              	   num -= 90;
			  }
              else if(num >= 50)
              {
                   printf("L");
                   num-=50;
              }
              else if(num >= 40)
              {
                   printf("XL");
                   num-=40;
              }
              else if(num >= 10)
              {
                   printf("X");
                   num-=10;
              }
              else if(num >= 9)
              {
                   printf("IX");
                   num-=9;
              }
              else if(num >= 5)
              {
                   printf("V");
                   num-=5;
              }
              else if(num >= 4)
              {
                   printf("IV");
                   num-=4;
              }
              else
              {
                  printf("I");
                  num-=1;
              }
    }
    
    printf("\n");
    system("pause");
}