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

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

void print_hex(uint16_t num) {
    // Your logic here
    if(num==0){
        putchar('0');
        return;
    }
    int i=0;
    char hex[5];
    while(num>0){
        int val=(num&0xF);
        hex[i++] = (val < 10) ? ('0' + val) : ('A' + val - 10);
        num>>=4;
    }
    while(i>0){
        putchar(hex[--i]);
    }
}

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