Return místo break ve switch

#include <iostream>
#include <stdio.h>
#include <sstream>

using namespace std;

int hex_to_int(unsigned char input);

int main() {
    char hex_input[6]; // tyto tri radky jsem vygooglil :-D
    puts("Zadejte HTML kod barvy (bez hashtagu): ");
    fgets(hex_input, 6, stdin);

    int out[6];

    out[0] = hex_to_int(hex_input[0]); // tady jsem mel for cyklus, ale kdyz to nefungovalo, zkusil jsem to rucne
    cout << out[0] << endl;
    cout << hex_input[0] << endl; // tady to pokazde vypise -1

    return 0;
}

int hex_to_int(unsigned char input) {

switch(input) {
case '0': return 0;
case '1': return 1;
case '2': return 2;
case '3': return 3;
case '4': return 4;
case '5': return 5;
case '6': return 6;
case '7': return 7;
case '8': return 8;
case '9': return 9;
case 'a': return 10;
case 'A': return 10;
case 'b': return 11;
case 'B': return 11;
case 'c': return 12;
case 'C': return 12;
case 'd': return 13;
case 'D': return 13;
case 'e': return 14;
case 'E': return 15;
case 'f': return 16;
case 'F': return 16;
default: return -1;
}

}