How to Determine if a Double Represents an Integer?

Determining if a Double is an Integer in Code

Is it possible to determine whether a double-precision floating-point number represents an integer value? This can be useful in various scenarios, such as performing integer-related operations or ensuring data accuracy.

To test if a double variable represents an integer, you can employ several methods. One common approach is to compare the variable's fractional part to zero. In other words, you can check if the result of the modulo operation (variable % 1) is equal to zero. If it is, then the variable is an integer; otherwise, it contains a fractional part.

Here's an example:

double variable = 5.0;
if ((variable % 1) == 0) {
    // Integer
} else {
    // Not an integer
}

In this example, variable represents the double-precision value 5.0. Since the modulo operation (variable % 1) results in zero, we can conclude that variable is an integer.

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