C rgb() function

#include <iostream>

char int_to_hex(int digit){
    switch (digit){
        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 10:
            return 'A';
        case 11:
            return 'B';
        case 12:
            return 'C';
        case 13:
            return 'D';
        case 14:
            return 'E';
        case 15:
            return 'F';
        default:
            return '-';     //should not happen
    }
}

void rgb(int r, int g, int b){
    /*
    Turns color based on RGB values between 0 and 255 to hexadecimal string.
    */
    char result[8];
    result[0] = '#';
    result[1] = int_to_hex(r / 16);
    result[2] = int_to_hex(r % 16);
    result[3] = int_to_hex(g / 16);
    result[4] = int_to_hex(g % 16);
    result[5] = int_to_hex(b / 16);
    result[6] = int_to_hex(b % 16);
    result[7] = '\0';
    std::cout << result << std::endl;
}

int main() {
    int r, g, b;
    fakeCin >> r >> g >> b;
    rgb(r, g, b);
    return 0;
}