Explain this floating point behavior

Question

Please explain why the following pieces of code behave differently.

#include
int main(){
 float a=0.1;
 if(a<0.1)
  printf(\"less\");
 else         


        

Answer 1

I would recommend you reading What Every Computer Scientist Should Know About Floating-Point Arithmetic. Basically when working with floating point numbers you should always check if a number is equal, smaller than or greater than some other number given some precision (epsilon) that you have defined.