C++ Math log10() Function

C++ Math log10() 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 log10()

The function computes the common algorithm (base 10) of a given number.

Mathematically:

Suppose a number is 'x':

log10x = log10(x);

Syntax

float log10(float x);
double log10(double x);
long double log10(long double x);
double log10(integral x);

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

Parameter

x: The value whose common logarithm is to be calculated.

Return value

Following are the return values of a given number:

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

Example 1

Let's see a simple example when the value of x is greater than 1.

#include <iostream>
#include<math.h>
using namespace std;
int main()
{
    int x=5;
    std::cout << "Value of x is : " <<x <<std::endl;
    cout<<"Log value of x is : "<<log10(x);
    return 0;
}

Output:

Value of x is : 5
Log value of x is : 0.69897

In this example, the value of x is 5. Therefore, the function log10() returns the positive value i.e 0.69.

Example 2

Let's see a 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<<"Log value of x is : "<<log10(x);
    return 0;
}

Output:

Value of x is : 1
Log value of x is : 0

In this example, the value of x is 1. Therefore, the function log10() returns the value zero.

Example 3

Let's see a simple example when the value of x is 0.3.

#include <iostream>
#include<math.h>
using namespace std;
int main()
{
    float x=0.3;
    std::cout << "Value of x is : " <<x <<std::endl;
    cout<<"Log value of x is : "<<log10(x);
    return 0;
}

Output:

Value of x is : 0.3
Log value of x is : -0.522879

In this example, the value of x is 0.3. Therefore, the function log10() returns the negative value i.e -0.52.

Example 4

Let's see a 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<<"Log value of x is : "<<log10(x);
    return 0;
}

Output:

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

In this example, the value of x is zero. Therefore, the function log10() returns negative infinity value.

Example 5

Let's see a simple example when the value of x is -4

#include <iostream>
#include<math.h>
using namespace std;
int main()
{
    float x= -4;
    std::cout << "Value of x is : " <<x <<std::endl;
    cout<<"Log value of x is : "<<log10(x);
    return 0;
}

Output:

Value of x is : -4
Log value of x is : nan

In this example, the value of x is -4. Therefore, the function log10() returns Not a Number(nan).

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C++ Math log10() Function

C++ Math log10()

Mathematically:

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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