// Program A
int main(int argc, char **argv)
{
  int n1, n2;
   // This program expects to get two numbers in argv.  
   // So the value of argc must be 3.
   if( argc != 3)
   {
     printf("wrong number of arguments\n");
     return 1;
   }
   n1 = atoi(argv[1]);
   n2 = atoi(argv[2]);

   // now do something with the two numbers not shown



   // exit the program
   return 0;
}

int main()
{
   // send program a.exe two numbers -- 12 and 13
    system("a.exe 12 13");

    return 0;
}

// program b.exe
int main()
{
     fstream out(myfile.txt);
    out << "12\n13\n");
    fclose(out);
    system("a.exe <myfile.txt");

   return 0;
}

#include <iostream>
using namespace std;
 
int main(int argc, char **argv)
{
  int n1, n2;
   // This program expects to get two numbers in argv.
   // So the value of argc must be 3.
   if( argc != 3)
   {
     printf("wrong number of arguments\n");
     return 1;
   }
   n1 = atoi(argv[1]);
   n2 = atoi(argv[2]);
 
   cout << "The output in the driver program is " << n1 + n2 ;
 
   return 0;
}

#include <iostream>
 
int main()
{
    system("driver 12 13") ;
    return 0;
}

// program A 
#include <iostream>
using namespace std;

int main(int argc, char* argv[])
{
	int a,b;
	cout << "Enter first number\n";
	cin >> a;
	cin.ignore();
	cout << "Enter second number\n";
	cin >> b;
	cin.ignore();
	cout << "a: " << a << " b: " << b << "\n";
	return 0;
}

// Program B.  This will send two numbers, 12 and 13, to program A.
#include <stdio.h>
#include <stdlib.h>



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

	char *cmd = "..\\progA\\debug\\progA.exe";
	FILE *ptr;
	if ((ptr = _popen(cmd, "w")) != NULL)
	{
		fprintf(ptr, "%d\n%d\n", 12, 13);
		_pclose(ptr);
	}
	return 0;

	return 0;
}