Thread: Global variable

Code:

static bool var1;

yep, as sly mentioned..

A static variable is declared only once; remains active for the program life yet is only visible where it is declared.

ex:

Code:

int count()
{
  static bool status = false;  // Declared only the first time this function is called ignored each subsequent call.

  status = !status;
}

But i can't put the bool in that function other wise it will always reset to false.

Another way: declare your boolean variable in main(), and then send it to the function as an argument. If you make the function parameter a reference, which just means you put a '&' symbol to the right of the type, then the function will be able to change the value of the variable back in main(). Here is an example:

Code:

#include <iostream>
using namespace std;

void myFunc(bool& aFlag, int num)
{
	if(aFlag)
	{
		cout<<num<<endl;
	}
	else
	{
		cout<<"Flag is false."<<endl;
		aFlag = true;
	}
}

int main()
{
	bool myFlag = false;
	myFunc(myFlag, 10);
	myFunc(myFlag, 5);

	return 0;
}

The parameter variable aFlag becomes a synonym, or alternate name, for myFlag back in main(), and as a result myFlag and aFlag are the same thing.