how to return 2 or 3 value from function.

Either use global variables (those you declare above Start())

or use by reference parameters.

https://docs.mql4.com/basis/variables/formal - see 3rd example

Either use global variables (those you declare above Start())

or use by reference parameters.

https://docs.mql4.com/basis/variables/formal - see 3rd example

i dont get it, pls help me i am newbie learning MQL.

example :

int this_function(){

x= 4;

y=5;

z=6;

return(x);

}

======

int get value = this_function();

=============From Above code. how?

When you pass parameters by reference (note the "&" before each parameter in func declaration) you actually pass their address in memory. So when you make changes to them inside a function, you are changing the original value of the passed variables.
You can't use "return" to return more then 1 value.

void start()
{
   double A,B,C;
   func(A,B,C);
   Print(A,B,C);
   //Result: 456
}

void func(double& x, double& y, double& z)
  {
   x = 4;
   y = 5;
   z = 6;
}