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C++ Math logb() Function

C++ Math logb() 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 logb()

The function computes the logarithm of a given number, using FLT_RADX as base for the logarithm.

Generally, FLT_RADX is equal to 2. Therefore, logb() is equivalent to log2().

Syntax

Suppose a number is 'x'. Syntax would be:

float logb(float x);
double logb(double x);
long double logb(long double x);
double logb(integral x);

Parameter

x: The value whose logarithm is to be calculated.

Return value

It returns base FLT_RADX logarithm of x.

If x is zero, then it may cause domain or pole error depending on the library implementation.

Example 1

Let's see the simple example when the value of x is integer type. 

#include <iostream>
#include<math.h>
using namespace std;
int main()
{
     int x=6;
     std::cout << "Value of x is :" <<x<< std::endl;
     cout<<"logarithm value of x is:"<<logb(x);
     return 0;
}

Output:

Value of x is :6
logarithm value of x is:2

In this example, the value of x is 6. The logb() function computes the logarithm of x base FLT_RADX.

Example 2

Let's see the simple example when the value of x is float type.

#include <iostream>
#include<math.h>
using namespace std;
int main()
{
     float x=10.4;
     std::cout << "Value of x is :" <<x<< std::endl;
     cout<<"logarithm value of x is:"<<logb(x);
     return 0;
}

Output:

Value of x is :10.4
logarithm value of x is:3

In this example, the value of x is 10.4. The logb() function computes the logarithm of x base FLT_RADX.

Example 3

Let's see the simple example when the value of x is zero.

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

Output:

Value of x is  :0
logarithm value of x is : -inf

Next TopicC++ Math Functions




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