How to check whether input value is integer or float

Question

How to check whether input value is integer or float  Suppose 312 100 3 12 Here i need check whether 3 12 is a float value or integer value  i e   without any decimal place value

User · Answer

The ceil and floor methods will help you determine if the number is a whole number.

However if you want to determine if the number can be represented by an int value.

if(value == (int) value)

or a long (64-bit integer)

if(value == (long) value)

or can be safely represented by a float without a loss of precision

if(value == (float) value)

BTW: don't use a 32-bit float unless you have to. In 99% of cases a 64-bit double is a better choice.

User · Answer

Do this to distinguish that   If for example your number is 3 1214 and stored in num but you don t know kind of num   num   3 1214    cast num to int int x    int num  if x    num         num is a integer    else      num is float     In this example we see that num is not integer

User · Answer

You can use Scanner Class to find whether a given number could be read as Int or Float type    import java util Scanner   public class Test        public static void main String args     throws Exception         Scanner sc new Scanner System in         if sc hasNextInt             System out println  This input is  of type Integer         else if sc hasNextFloat             System out println  This input is  of type Float         else          System out println  This is something else

User · Answer

You can use RoundingMode  UNNECESSARY if you want accept exception thrown otherwise  new BigDecimal value  setScale 2  RoundingMode UNNECESSARY        If this rounding mode is specified on an operation that yields an inexact result  an ArithmeticException is thrown    Exception if not integer value   java lang ArithmeticException  Rounding necessary

User · Answer

How about this  using the modulo operator  if a b  0         System out println  b is a factor of a  i e  the result of a b is going to be an integer      else       System out println  b is NOT a factor of a

User · Answer

You should check that fractional part of the number is 0  Use  x  Math ceil x    or  x  Math round x    or something like that

User · Answer

Also    value   1     0   would work

User · Answer

Math round   returns the nearest integer to your given input value  If your float already has an integer value the  nearest  integer will be that same value  so all you need to do is check whether Math round   changes the value or not   if  value    Math round value       System out println  Integer      else     System out println  Not an integer

[java] How to check whether input value is integer or float?

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