syntax error :'=' and fatal error, trying to do a 'for' loop

[cheetaqueen]

every time i run this in vs2010, is writes "syntax error :'='" and fatal error, what is my mistake?
if(a*a+b*b==c*c||a*a+c*c==b*b||b*b+c*c*==a*a)
d=5;

[donbock]

What are the types of variables a, b, and c?
(I want to make sure they aren't pointers.)

The title of your post refers to a for loop. How is that involved here?