How to execute a another c++ program when an option is chosen? - c++

Question

I have this code when executed it will let the user choose an option. once the user enters an option the program will be cleared and execute another program. below is the sample. at the bottom is another program of option 1
#include <iostream>
using namespace std;
int main()
{
int a;
cout<<"Please choose an option below: \n";
cout<<"1. Area of Shapes\n";
cout<<"2. Cost of your items\n";
cout<<"3. Flood Control\n";
cout<<"4. Fibonacci Numbers\n";
cout<<"5. Addition Table\n";
cout<<"6. Exit\n";
cin>> a;
system("pause");
return 0;
}
Here is the program for option 1:
#include <iostream>
using namespace std;
float circle (float a)
{
float z;
z = 3.141593*(a*a);
return (z);
}
float square (float b)
{
float y;
y = b * b;
return (y);
}
float rectangle (float c, float d)
{
float x;
x = c * d;
return (x);
}
float triangle (float e, float f)
{
float w;
w = (e * f) / 2;
return (w);
}
void exit ()
{
cout << "THANK YOU! GOODBYE!" <<endl;
}
int main()
{
float n;
float l;
float m;
float radius;
float side;
float length;
float width;
float base;
float height;
do
{
cout << "1 => Area of Circle" <<endl;
cout << "2 => Area of Square" <<endl;
cout << "3 => Area of Rectangle" <<endl;
cout << "4 => Area of Triangle" <<endl;
cout << "0 => Exit" <<endl;
cout << "Please enter number of your choice: ";
cin >> n;
{
if (n==0)
{
exit ();
system("pause");
return 0;
}
else if (n==1)
{
cout << "Enter radius of the circle: ";
cin >> radius;
l = circle (radius);
cout << "Area of the circle is: " <<l <<endl;
}
else if (n==2)
{
cout << "Enter side of the square: ";
cin >> side;
cout << "Area of the square is: " <<square (side) <<endl;
}
else if (n==3)
{
cout << "Enter length of the rectangle: ";
cin >> length;
cout << "Enter width of the rectangle: ";
cin >> width;
m = rectangle (length, width);
cout << "Area of the rectangle is: " <<m <<endl;
}
else if (n==4)
{
cout << "Enter base of the triangle: ";
cin >> base;
cout << "Enter height of the triangle: ";
cin >> height;
cout << "Area of the triangle is: " <<triangle (base, height) <<endl;
}
else
cout << "Invalid number. Please enter a valid number below" <<endl;
}
}
while (n!=0);
cout <<endl <<endl;
system("pause");
return 0;
}

Answer 1

If you truely want to replace the current program with another, look to the exec family of system calls.

Answer 2

Put each "program" in its own file (or not, but it's a good idea to keep them separate).
Rename each "program"'s main to something meaningful, like "areas".
Declare that function in a header.
Include that header in your "controller" program.
Call the corresponding "program function" from the "controller" based on the input you read.