problem with math.h lib ???

[elmar44]

Hi to all programmers..
Now i used the math.h lib first time to get access to functions like
sin() , pow(x,y) ....
So i start with a sinple check:

#include math.h
float x, result;
x = 45
result = sin(x); // the result = 0.707!
..(break)
I used the debugger to watch 'result' and the displayed result is: "1"
sin(45°) = 1 ????
OK - changed the line to result = tan(45);
The displayed result is "0"....... tan(45°) = 0 ?????
So i try another function:
float x, y, result
x = 10;
y = 3;
result = pow(x,y); // this means 10^3 = 1000 !
the displayed result is : -1.345E-24 or results like this - not a "1000"

SO: HOW CAN I USE THE MATH.H LIB ???
What's wrong ????

Thank you for help

[valemike]

Which debugger are you using? My past experience has shown that the MPLAB IDE debugger does not interpret CCS's floats properly. A printf ("%f", floar_var); of your value to Hyperterminal ought to give you the correct results though.

-Mike

[PCM programmer]