How to get variables inside a function?

Ok, i have a globally defined variable. In one function the variable gets a value. If i then try to use that variable in a different function, the value gets "erased" or basically, it can't read in the value cause it was stored in the other function.... how do i get around that?

Thanks!

//---------------------LOCAL VAR --------------------------------------------

if you declare a variable within a function, it can only be used in that function eg


void functionA()
{
int localvar!;
double localvarB;

do something to localvarA
do something to localvarB



}
Now the varlue of localvarA and localvarB will not be known outside the functionA()
eg
void start()
{
functionA(); //although you execute this function A, the value of localvarA and localvarB will not be known here // which is one reason for uising return(...)



}

//--------------------------- GLOBAL VAR ---------------------------


declare your global variables at the start of the program eg


extern int extvarA = 10; // this is a global variable that you can change the value without having to change your EA code
int globalvarA; // declare yr global variables here

double globalvarB=0.3434;




void functionA()
{
int localvar!;
double localvarB;

do something to localvarA and globalvarA ; // u can use the globalvarA and B here because they have been declared outside the functionA()

do something to localvarB and gloabalvarB



}


void start()
{
functionA();
double anotherlocalvarbelongingtostart = globalvarA/globalvarB; // u can now use these globalvarriables anywhere

}



------------------------------------------------------------------------


another way of passing parameters from a function with local variables- using the ampersand "&"


if you use return, u can only return 1 value; but if you use "&", u can return more values

eg
extern int MagicNo = 123456;


int start() //main program
{
double X; //let's say u declare a local variable X and Y inside start() which means they are local to start() only

int Y;

functionA(MagicNo, Symbol(),X,Y); // by executing this functionA, u pass parameters that u want into functionA ie MaigicNo, SYmbol(), X,Y
// although u are passing X and Y values into the functionA, the intention is not really to pass it to functionA but to really retrieve the values computed in functionA
// as a result u can now use X and Y with values obtained from functionA in start() now, eg



double origin = (X+Y)/2.0 ;
}



void functionA(int magic, string symbol, double& localvarA, int& localvarB) // note the ampersand sign in the last two variables

{ // of course in my example here i did not make use of magic and symbol ; it is just to tell u that u can pass values from main program to here this way if needed

localvarA = 1.234*5;
localvarB= 333*444;

}

sounds like a code error to me. post your codes here and we can correct you directly.