global variables urgent,

hey
i declare 3 global variables inside a formula.but can not refer those variables in another formula in the same report.
tell me how & where to declare global variables.
thanx.hi
try using this way :

formula @.x
numbervar a;
a:=10+20;

formula @.y
numbervar b;
numbervar a;
b:= 20+30;
b:=a+b;

as many variable as you want decalre in a formula, but the each formula should declare the variable.

This will give an idea about the global varialbles.
please try and let me know.|||Use shared variable also. Read it more in help file