running external program and obtaining returned integer

Question

I have the following MWE, which returns an integer:

#include <iostream>
using namespace std;

int main()
{
    int a = 2;
    return a;
}

Now I want to call this program via the command line (cmd) in Windows. Here is a program for how I do that:

#include <iostream>
#include <stdio.h>
#include <stdlib.h>

using namespace std;

int main()
{
    int a = system("c:\test_batch.exe");
    cout << a << endl;
    return 0;
}

However this does not return the value 2, but 0. I don't understand this as I thought system() returned the exit-code of the program, in this case 2.

Search for IPC - inter process communication.

Kiril Kirov
– Kiril Kirov

2012-10-31 12:20:51 +00:00
Commented Oct 31, 2012 at 12:20 — Kiril Kirov
– Kiril Kirov, Commented Oct 31, 2012 at 12:20

user1773602 · Accepted Answer · 2012-10-31 12:32:59Z

1

system returns a value returned by a command interpeter, not by actual command.

you need to do something like

int a = system("c:\test_batch.exe && exit %ERRORLEVEL%");

answered Oct 31, 2012 at 12:32

user1773602

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