c++ - How to set floating point precision inside a variable -

I am currently working on a program where I want to calculate the round value for only 2 digits after floating point Need I say, I have declared

  float a;    If  a = 3.555  will store it  a = 3.56 ,  
  A = 3.423 , the value of one will be  a = 3.423 , there will be no change.  
 I can do this to print output, but what should I do when it is stored in a variable and uses that variable for any other calculation?   
 
  Do not use floating point if you need two digits, decimal point. Use a fixed point number instead. For example, just use an integer that is 100 times greater than the decimal number that you want to represent. Trying to fit the base 2 floating point number into rounding rules is not just satisfactory results for you.   

 


  







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