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

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

void print_hex(uint16_t num) {
    if(num == 0){
        printf("0");
        return ;
    }
    char bits[5];
    int i = 0;
    while(num) {
        int rem = num % 16;
        bits[i++] = rem < 10 ? rem + '0': rem - 10 + 'A';
        num = num/16;
    }
    for(int k = i-1; k>=0; k--) {
        printf("%c", bits[k]);
    }
}

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