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");
    }
    char hex[]="0123456789ABCDEF";
    char buffer[5];
    int i=0;
    while(num>0){
        buffer[i++]=hex[num%16];
        num/=16;
    }
    for(int j=i-1;j>=0;j--){
        putchar(buffer[j]);
    }
            
}
        
    


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