callfunc.bas

这是一个简易的basic语言解释器, 可供我们学习和改进.

rem ----------------------------------------------------
rem CallFunc.BAS
rem ----------------------------------------------------

Print "CallFunc.BAS -- Test BASIC User-defined Function Statements"
Print "The next printed line should be from the Function."
Print
testvar = 17

x = TestFnc( 5, "Hello", testvar )

Print
Print "This is back at the main program. "
Print "The value of variable <testvar> is now "; testvar
Print "The returned value from the function is "; x

Print "Did it work?"
End

rem ----------------------------------------------------
rem Subroutine TestFnc
rem ----------------------------------------------------

Function TestFnc( xarg, yarg$, tvar )
   Print "This is written from the Function."
   Print "The value of variable <xarg> is"; xarg
   Print "The value of variable <yarg$> is "; yarg$
   Print "The value of variable <tvar> is "; tvar
   tvar = 99
   Print "The value of variable <tvar> is reset to "; tvar
   TestFnc = xarg + tvar
   Print "The Function should return "; TestFnc
End Function