c++ problem

#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) {
int result;

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

return result;
}