Question

I’m trying to learn C++, and I learn by doing…

What this code’s end-result is going to be is that it outputs the char* argv[2] to a function which only takes strings as input, and it will output a changed string.

How can I convert char* argv[2] into a string?

Everything I’ve tried ends up crashing my command prompt, for some reason.

int main(int argc, char* argv[])
{
    std::string com2 = argv[2];
    char* com1[4];
    com1[1] = "-f";
    com1[2] = "--file";
    com1[3] = "-t";
    com1[4] = "--text";
    if (strcmp(argv[1], com1[1]) == 0) {

        cout << com2;
    }
}

Answer 1

Array indexs run from 0 to N - 1, where N is the number of elements in the array. Therefore 4 is an invalid index, and results in undefined behaviour.

Ensure the correct number of arguments have been supplied to the program, by checking the value of argc, before accessing elements in argv.