Problems with Test

[James McKenzie]

All:

I'm trying to convert one integer number using a float number factor.  
Here is the code:

int ry = 125;
double ryf;

ryf = ry/1440;

The result is 0 and should be 0.06666666667 (or even more sixes.)

BTW, if I change ry to 1440 the result is 1.00000.

What am I doing 'incorrectly'?

James McKenzie

[Charles Davis]

On 10/31/10 9:23 PM, James McKenzie wrote:
> All:
>
> I'm trying to convert one integer number using a float number factor. 
> Here is the code:
>
> int ry = 125;
> double ryf;
>
> ryf = ry/1440;
>
> The result is 0 and should be 0.06666666667 (or even more sixes.)

And why should it be? None of the values in the expression 'ry/1440' are
of type 'double'. They're both 'int's, so the compiler sees it as
integer division instead of FP division. The C language spec doesn't
require the compiler to infer that you wanted FP division when you
assign to a variable of FP type.
> What am I doing 'incorrectly'?

Now, if your assignment looked like this:

ryf = ry/1440.0;

then it would work correctly. Now the 1440 is of type 'double', so the
compiler emits a floating-point division.

Chip