general question about variables

I

integreat

I can't for the life of me get this line of code to work:

deltaX = .01

When I go to the immediate window I find deltaX = 0

I can't assign a decimal value to that variable. I remember it was much
easier in quick basic to do this What am I doing wrong?

BTW the variable deltaX has been dimensioned as LONG

The good news is that I almost have a custom function that will allow
intergration by the trapezoidal method.
 
J

JMB

Long is an integer data type

Maybe Currency, Single, or Double would work better?


Single
(single-precision floating-point) 4 bytes -3.402823E38 to -1.401298E-45 for
negative values; 1.401298E-45 to 3.402823E38 for positive values

Double
(double-precision floating-point) 8 bytes -1.79769313486231E308 to
-4.94065645841247E-324 for negative values; 4.94065645841247E-324 to
1.79769313486232E308 for positive values

Currency
(scaled integer) 8 bytes -922,337,203,685,477.5808 to
922,337,203,685,477.5807
 
J

joeu2004

integreat said:
I can't for the life of me get this line of code to work:
deltaX = .01
When I go to the immediate window I find deltaX = 0
[....] BTW the variable deltaX has been dimensioned as LONG
Click to expand...

That is precisely your mistake. Type long is an integer type.
When you assign a floating-point value to an integer type, the
value is rounding (apparently using banker's rounding! :-<) to
integer value. Either declare deltaX as a floating-point type,
e.g. double, or do not declare its type at all, which some
people consider "poor form".
 
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