global and local variables

i want a bunch of sub routines, but be able to use the variable in the sub routine, outside of the sub routine. for example:

void info (void)
{
do all this stuff which includes int a;
}

int main()
{
info();
now here i want to use a, but outside the sub routine, for example
cout a;
}

how do i do that? when i get home i'll paste the actual program im trying to do, thanks. It doesnt recognize a outside the sub routine.ANY HELP IS APPRECIATED

you could have info return the value you want to use outside the function. For example:

int info ()
{
do all this stuff which includes int a;
}

int main()
{
int a;
a = info();
cout << a;
}

hope this helps

when using a sub routine you can either yes assign the value of the subroutine to a variable in order to store and use it later in the program.

Or you can use reference parameters


declare your subroutine or subfunction

void subroutine( variabletype &variablename);


void subroutine(variabletype &variablename)
{
// when calculations are done in here now it will be passed back
//up to the function in which it was called from
}

void main()
{

int a = 0;

subroutine(a);

cout <<a; // the new value will be there
}