Float doesn't change when i add 0.1 to it

Question

I am quite a newbie to c. So when i writing a small game demo, i face a really strange problem.

 void testC()
 {
     float a = 825300160;
     float b = a +         


        

Answer 1

There's not enough precision in the float type. If you really need to distinguish a 0.1 addition to a number as large as 825300160, use double.