How to Determine if a Double-Precision Floating-Point Number is an Integer?

Verifying Integer Status of a Double

Determining whether a double-precision floating-point number is an integer value can be useful in various programming scenarios. In the provided code snippet:

double variable;
variable = 5;
/* the below should return true, since 5 is an int.
if variable were to equal 5.7, then it would return false. */
if(variable == int) {
    //do stuff
}

The expression variable == int cannot be evaluated because int refers to a data type, not a specific integer value. To check if a double is indeed an integer, alternative methods are employed.

Using the Modulo Operator:

One method involves using the modulo operator (%):

if variable % 1 == 0:
    # The variable is an integer since its remainder when divided by 1 is zero

This approach capitalizes on the fact that integer division in floating-point arithmetic always results in a zero remainder.

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