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)
    {
        printf("0");
        return;
    }
    int i = 0;
    char buff[32];
    while (num>0) {
        int digit = num % 16;
        if(digit>9)
            buff[i] = 'A' + (digit - 10);
        else
            buff[i] = digit + '0';
        num/= 16;
        i++;
    }
    for(int j=i-1;j>=0;j--)
        printf("%c",buff[j]);
}

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