Question

i have following code

#include <iostream>
using namespace std;
int main(int argc,char arg[]){

    int a=arg[1];
    int b=arg[2];
    int c=a+b;
    cout<<c<<endl;


     return 0;
}

i am using windows 7 microsoft visual c++ 2010
how run it from command line?

Answer 1

Navigate to the directory where the executable (.exe) is located. Then type the executable’s name followed by two integer parameters.

C:\TestProg\> TestProg 5 6

The problems in your original example are corrected here:

#include <iostream>
#include <sstream>

int main(int argc, char *arg[])
{
    std::stringstream sa;
    std::stringstream sb;
    int a;
    int b;
    int c;

    if (argc >= 3)
    {    
        // Convert string parameter into an integer.
        sa.str(arg[1]);
        sa >> a;

        if (!sa)
        {
            return 1;    // error
        }

        // Convert string parameter into an integer.
        sb.str(arg[2]);
        sb >> b;

        if (!sb)
        {
            return 1;    // error
        }
    }
    else
    {
        return 1;    // error
    }

    c = a + b;
    std::cout << c << std::endl;
    return 0;
}