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

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

void print_hex(uint16_t num) {
    char bits[5];
    int i = 0;
    if(num ==0){printf("0"); return;}

    while(num){
        int rem = num % 16;
        bits[i++] = rem < 10? ('0' + rem) : ('A' + (rem - 10));
        num = num /16;
    }
    bits[i] = '\0';
    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;
}