CallFunc.BAS -- Test BASIC User-defined Function Statements
The next printed line should be from the Function.

This is written from the Function.
The value of variable <xarg> is 5 
The value of variable <yarg$> is Hello
The value of variable <tvar> is  17 
The value of variable <tvar> is reset to  99 
The Function should return  104 

This is back at the main program. 
The value of variable <testvar> is now  17 
The returned value from the function is  104 
Did it work?
