ccs complier float issue with pic18f4620

raman00084 · Oct 22, 2015

float32 a = 100/1000;

printf(%f,a)

the result is 0.00

if i change

float32 a =1000/1000

the result is 1.0

kindly help
regards
kalyan

FvM · Oct 22, 2015

The result is correct according to C type propagation rules and will be obtained with any C compiler. 100/1000 is calculated as integer division (result 0) and then converted to float.

You may want to write e.g.:

Code:

float32 a = 100.0/1000;
float32 a = 100/1000.0;
float32 a = float(100)/1000;

In any case, at least one of the numbers must be of the float type to cause a float division.

xenos · Oct 22, 2015

FvM said:
Code:

... float32 a = [B][U]float[/U][/B](100)/1000;

...

This should be

Code:

float32 a = ((float)100)/1000;

(except if we write C++)

The other two, are both correct.

FvM · Oct 22, 2015

Yes, true indeed.

Typecast has higher priority than arithmetic operation, one pair of brackets can be omitted.

ccs complier float issue with pic18f4620

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