Question

Alright, I’m trying to get arguments to work properly with a small test application. My code is below. I’m not too experienced at C++, so I’m not sure why when I launch test with -print (or –print) it automatically states ‘Not a valid option’ and then finishes up.

#include <iostream>  int main(int argc, char* argv[]) {     int option;     option = 1;     char* argument;     argument = argv[option];     while (option < argc)     {         if (argument == '-print')         {             std::cout << 'Printing Extra Text';         }         else         {             std::cout << 'Not a valid option' << std::endl;         }         option++;     }     std::cout << 'Printing normal text' << std::endl;     return 0; } 

Am I doing this right? Thanks in advance.

Answer 1

You’re comparing the memory address of the string ‘-print’ to the memory address of argument. This won’t work! Use strcmp() to compare string values. Instead of:

if (argument == '-print') 

do

if (strcmp(argument, '-print') == 0)