C Program For Roman Number

#include<stdio.h>

#include<string.h>

int main()

{

    int dec[] = {1000,900,500,400,100,90,50,40,10,9,5,4,1};

    char *rom[]= {"M","CM","D","CD","C","XC","L","XL","X","IX","V","IV","I"};

    int givennumber,i;

    char romannumber[500] = "";

    printf("\nENTER A POSITIVE INTEGER NUMBER\n");

    scanf("%d",&givennumber);

   

    for(i = 0;i<13;i++)

    {

        while(givennumber >= dec[i])

        {

            givennumber = givennumber - dec[i];

            strcat(romannumber,rom[i]);

        }

    }

    printf("\nroman number is = %s\n",romannumber);

    return 0;

}