C++ Math log2() Function

C++ Math log2() 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 log2()

The function computes the base 2 logarithm of a given number.

Suppose a number is 'x':

log2(x) = log2x;

Syntax

float log2(float x);
double log2(double x);
long double log2(long double x);
double log2(integral x);

Note: The return_type can be float, double or long double.

Parameter

x: The value whose logarithm is to be calculated.

Return value

Parameter	Return value
x>1	Positive
x=1	Zero
1>x> 0	Negative
x= 0	-infinity
x<0	Not a Number(nan)

Example 1

Let's see the simple example when the value of x is greater than one.

#include <iostream>
#include<math.h>
using namespace std;
int main()
{
     int x=2;
     std::cout << "Value of x is : " <<x <<std::endl;
     cout<<"log2(x) = "<<log2(x);
     return 0;}

Output:

Value of x is : 2
log2(x) = 1

In this example, log2() function computes the logarithm value of base 2 when the value of x is greater than one

Example 2

Let's see the simple example when the value of x is equal to 1.

#include <iostream>
#include<math.h>
using namespace std;
int main()
{
     int x=1;
     std::cout << "Value of x is : " <<x <<std::endl;
     cout<<"log2(x) = "<<log2(x);
     return 0;
}.

Output:

Value of x is : 1
log2(x) = 0

In this example, log2() function computes the logarithm value of base 2 when the value of x is equal to one.

Example 3

Let's see the simple example when the value of x lies between 0 and 1.

#include <iostream>
#include<math.h>
using namespace std;
int main()
{
     float x=0.2;
     std::cout << "Value of x is : " <<x <<std::endl;
     cout<<"log2(x) = "<<log2(x);
     return 0;
}

Output:

Value of x is : 0.2
log2(x) = -2.32193

In this example, log2() function computes the logarithm value of base 2 when the value of x is equal to 0.2.

Example 4

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

#include <iostream>
#include<math.h>
using namespace std;
int main()
{
     int x=0;
     std::cout << "Value of x is : " <<x <<std::endl;
     cout<<"log2(x) = "<<log2(x);
     return 0;
}

Output:

Value of x is : 0
log2(x) = -inf

In this example, log2() function computes the logarithm value of base 2 when the value of x is equal to 0.

Example 5

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

#include <iostream>
#include<math.h>
using namespace std;
int main()
{
     float x= -1.50;
     std::cout << "Value of x is : " <<x <<std::endl;
     cout<<"log2(x) = "<<log2(x);
     return 0;
}

Output:

Value of x is : -1.5
log2(x) = nan

In this example, log2() function computes the logarithm value of base 2 when the value of x is less than zero.

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C++ Math log2() Function

C++ Math log2()

Suppose a number is 'x':

Syntax

Note: The return_type can be float, double or long double.

Parameter

Return value

Example 1

Example 2

Example 3

Example 4

Example 5

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