C++ Math ilogb()

Math ilogb() Function

In C++, the ilogb() function is defined in the <cmath> or <math.h> header file and is used to calculate the exponent part of a floating-point number. It returns the integral value of the logarithm of the given number using FLT_RADIX as the base.

The ilogb() function is equivalent to converting the result of logb() into an integer.

Syntax

It has the following syntax.

Parameters

x: It is the value whose exponent is to be calculated.

Return value

Examples of the List ilogb() Function

Here, we are going to discuss several examples to demonstrate the List ilogb() Function Function.

Example 1: Calculate the Exponent Part of a Positive Integer Using ilogb()

This example demonstrates how the ilogb() function calculates the exponent part of a positive integer value.

Output:

Value of x is : 4
Exponent value of x is : 2

Example 2: Calculate the Exponent Part of a Floating-Point Value Using ilogb()

This example demonstrates how the ilogb() function calculates the exponent part of a floating-point number.

Output:

Value of x is : 10.5
Exponent value of x is : 3

Example 3: Calculate ilogb() for Zero

This example demonstrates how the ilogb() function behaves when the input value is 0. In this case, the function returns INT_MIN.

Output:

Value of x is : 0