Convert a Positive Decimal Number to Binary, Octal or Hexadecimal

/*
Write a 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");
}

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' );

}