120. Convert Integer to Hex String Without sprintf or itoa functions

#include <stdio.h>
#include <stdint.h>

void print_hex(uint16_t num) {
    int leading = 1; // Used to skip leading zeros
    for (int i = 12; i >= 0; i -= 4) {
        uint8_t digit = (num >> i) & 0xF;
        if (digit || !leading || i == 0) {
            putchar(digit < 10 ? ('0' + digit) : ('A' + digit - 10));
            leading = 0;
        }
    }
}

int main() {
    uint16_t num;
    scanf("%hu", &num);
    print_hex(num);
    return 0;
}