Compile Error : ( Warning: Control Reaches End of Non-Void Function [-Wreturn-type] )

When I try to compile my code using this:g++ -Wall -std=c++11 -o test10 program10.cpp This occurs:

program10.cpp: In function 'int getInt(std::string)':
program10.cpp:76:1: warning: control reaches end of non-void function [-Wreturn-type]

Here is the code:

int getInt(string str) {
    string bin[] = {"11000", "00011", "00101", "00110", "01001",
                    "01010", "01100", "10001", "10010", "10100"};
    for (int i = 0; i < 10; i++) {
        if (str.compare(bin[i]) == 0) {
            return i;
        }
    }
}