How do I check if an int is a decimal?

Question

I need help with something that can help me check if an int is a decimal. Something like:

if(variable == decimal){ //assuming the variable was entered by a user
    System.out.println("This number is a decimal.");
} else 
    System.out.println("This number is an integer.");
}

a int is never a decimal. I think you mean ....is an number is a decimal — , Mar 14 '17 at 18:39
While all `int` can be written as a decimal it is expected to be a 32-bit signed integer i.e. binary rather than decimal, though the JVM could store it in any form. The most common variations are big and little endian. — Peter Lawrey, Mar 14 '17 at 18:57
In contrast not all `double` can be written as a decimal e.g. NaN, and +/i Infinity. — Peter Lawrey, Mar 14 '17 at 18:58

score 1 · Answer 1 · answered Mar 14 '17 at 18:44

1

If your "variable" value is a double then :

return Math.floor(variable) == variable;

Will return true if "variable" is an Integer.

answered Mar 14 '17 at 18:44

Enzo Nocera

54
6

sorry I forgot to mention that my variable is an int – A. Wang Mar 14 '17 at 18:45
@A.Wang So even if your user enter "23.441" for instance. Your "variable" object will get the "23" value :p – Enzo Nocera Mar 14 '17 at 18:46

How do I check if an int is a decimal?

1 Answers1