convert a positive decimal number to Binary, Octal or Hexadecimal

/* P5.5 Program to convert a positive decimal number to Binary, Octal or Hexadecimal */
#include<stdio.h>
void convert(int, int);
main()
{
    int num;
    printf("Enter a positive decimal number : ");
    scanf("%d", &num);
    convert(num, 2);
    printf("\n");
    convert(num, 8);
    printf("\n");
    convert(num, 16);
    printf("\n");
}/*End of main()*/

void convert (int num, int base)
{
    int rem = num%base;
   
    if(num==0)
        return;
    convert(num/base, base);
   
    if(rem < 10)
        printf("%d", rem);   
    else
        printf("%c", rem-10+'A' );
}/*End of convert()*/