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

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

void print_hex(uint16_t num) {
    // Take int value
    // Bitmask 4 LSB's (hex) value => convert to string representation
    // Shift num -> 4 bits
    // Repeat 4 times
    char hex_values[16] = {'0','1','2','3','4','5','6','7','8','9','A','B','C','D','E','F'};
    int int_nibble;
    int output[10];
    int i=0;

    if(num==0){
        printf("0");
        return;
    }
    while(num >> i*4){
        int_nibble = (num >> i*4) & 0xF; //gives 4 LSB
        output[i] = int_nibble;
        //printf("%c",hex_values[int_nibble]);
        i++;
    }

    //Print reversed output
    for(int j=0;j<i;j++){
        printf("%c",hex_values[output[i-j-1]]);
    }
}

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