conversion between octal and hexa-decimal

#include<stdio.h>
int main()
//conversion between octal and hexa-decimal
{
    int num;
    printf("Enter any Octal number : \n");
    scanf(" %o",&num);
    printf("hexa-decimal number: %x",num);/*hexadecimal is a positional numeral
    system with a radix, or base, of 16.*/
    getch();
    return 0;

}