C++ Math ilogb() Function

C++ Math ilogb() Function with tutorial for beginners and professionals with examples on isgreaterequal(), less(), islessequal(), islessgreater(), isunordered(), exp(), frexp(), ldexp(), log(), log10(), modf(), exp2(), expm1(), log1p(), log2(), logb(), scalbn(), scalbln() etc.

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C++ Math ilogb()

The function returns the exponent part of a given number i.e integral part of logx.

ilogb() function is equivalent to (int)logb()

Syntax

int ilogb(float x);
int ilogb(double x);
int ilogb(long double x);
int ilogb(integral x);

Parameter

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

Return value

Parameter	Return value
x=0	-INT_MIN
x=NAN or +inf or _inf	INT_MAX

Example

Let's see the simple example

#include <iostream>
#include<math.h>
#include<float.h>
using namespace std;
int main()
{
 int x=4;
 std::cout << "Value of x is : " <<x<< std::endl;
 cout<<"Exponent value of x is : "<<ilogb(x);
 return 0;
}

Output:

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

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