Dear All ,

To calculate line slope I am using formula ,

line_slope = (meanxy - (meanx * meany)) / (meanyy) - (meany * meany));

All the variables are floats.

How to check whether the denominator .. (meanyy)- (meany * meany)) is zero ? Cause its float.

can I check with ..

float f1 = (meanyy) - (meany * meany) ;

if (f1 == 0.0) ..

Will this work surely ?


I am using this formula in project based on winXP but it survived. As soon as I ported the code
on DPMI based code , I observed a system hang after some time if all the points I supply are (0,0)
while drawing a line.

Thanks a lot in advance