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programmer100 · 03-12-2010, 07:46 PM

ok I have been trying to get this command line arguments thing going with somthing simple. So i decided to try a very simple calculator. However even though it compiles correctly, it seems to not read my arguments properly. Any help here?

Code:

#include <iostream> 

#include <cstdlib> 

using namespace std; 

int main(int argc, char *argv[]) 

{ 

    double a; 

    double b; 

    if(argc != 4) 

    { 

        cout<<"Invalid argument. Use calculate number operator number."; 

    } 

    else 

    { 

        a = atof(argv[1]); 

        b = atof(argv[3]); 

        if (argv[2] == "+") 

        { 

            cout<< a + b ; 

        } 

        else if (argv[2] == "-") 

        { 

            cout<< a - b; 

        } 

        else if (argv[2] == "*") 

        { 

            cout<< a * b; 

        } 

        else if (argv[2] == "/") 

        { 

            cout<< a / b; 

        } 

        else 

        { 

            cout<< "invalid operator"; 

        } 

    } 

    return 0; 

}

This is really annoying me.