#include <stdio.h>
#include <stdlib.h>

int main()
{

    int val = 0xC0FFEE;

    printf("HEX: %#x\n", val);
    printf("HEX: %#X\n", val);

    return 0;
}

/*
output:

HEX: 0xc0ffee
HEX: 0XC0FFEE

*/