Basically, I made a small calculator. It does the PEMDAS and factorials. Part of my code is here:

``````#include "stdafx.h"
#include "iostream"
#include "stdio.h"
#include "math.h"
using namespace std;
void raiz (void);
void suma (void);
etc.....``````
``````int main ()
{
short OPC;
do
{
switch (OPC)
{
case 1: raiz();
break;
case 2: suma();
break;
etc.....
case 8: break;
default: cout<<"\n Seleccion Erronea. \n ";

}
}
while ((OPC>8) || (OPC<1));

cout<<"\n\n\t\t ";
system  ("pause");
return 0;
}``````

After that, are the modules themselves (short MENU, void suma, etc) which do each process. Nevertheless, I want that if I selected the suma (Addition) and finished with it, the program would send me back to the menu and keep on going until I select case 8 (Quit).
Help?

Where does your loop actually start?
Where do you want the loop to start?

So I just showed you my libraries and the main part. There's a menu later on:

``````short MENU (void)
{
short RES;
cout<<"Seleccione su operacion. \n ";
cout<<"2. Suma \n ";
cout<<"3. Resta \n ";
cout<<"4. Multiplicacion \n ";
cout<<"5. Division \n ";
cout<<"6. Exponentes \n ";
cout<<"7. Factorial \n ";
cout<<"8. Salir. \n ";
cin>>RES;
system ("cls");
cout<<endl;
return RES;``````

And from the int main it sends me to any of the modules. Ex:

``````void factorial (void)
{	int VA;
int FACT=1;
cout<<"Ingrese factorial : ";
cin>>VA;
for (int CONT=1;CONT<=VA;CONT++)
{
FACT*=CONT;

}
cout<<"\n\n La respuesta es : "<<FACT <<endl;
return;
}``````

That's the factorial module, but after it finishes doing its own process, I want the loop to go back to the menu and do some other process from my modules, say, division:

``````void division (void)
{
double N1,N2,RE;
cout<<"\n Ingrese el primer numero : ";
cin>>N1;
cout<<"\n Ingrese el segundo numero : ";
cin>>N2;
RE=N1/N2;
cout<<"\n Su respuesta es: "<<RE <<"\n ";
return;
}``````

All in all, there are seven modules, not counting the menu itself.
Long story short, after a process is done, I want the menu to start over and send me to another process I wish to make.

@OP:

``````int userInput = 0;
const int QUIT = 8;
do{
cin >> userInput;
switch(userInput){
case SUB: doSub(); break;
case MULT: doMult(); break;
case DIV: doMult(); break;
case FACT: doFact(); break;
case QUIT: break;
default: doErrorInput(); break;
}