116. Convert Decimal Number to Binary or Hex Without itoa function

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

void binary(uint16_t num) {
    if(num == 0) {
        printf("%d", num);
        return;
    }
    int n = (num >= 0xF) ? 7 : 3;
    for(int i = n; i >= 0; i--) {
        printf("%d", (num >> i) & 1);
    }
}

void hex(uint16_t num) {
    int bits = 4;
    while(bits >= 0) {
        uint8_t byte = (num >> bits) & 0xF;
        char c = (byte < 10) ? ('0' + byte) : ('A' + byte - 10);
        printf("%c", c);
        bits -= 4;
    }
}

void print_base(uint16_t num, uint8_t base) {
    if(base == 2) binary(num);
    if(base == 16) hex(num);
}

int main() {
    uint16_t num;
    uint8_t base;
    scanf("%hu %hhu", &num, &base);

    print_base(num, base);
    return 0;
}