• On September 11, 2021
• By Karmehavannan
• 0 Comment
• Categories: function in C, pre-define maths function in C
• Tags: “math.h” header file

log function in C programming language

log function in C programming language

In this tutorial, we will discuss log function in the C programming language

Description

In the C programming language, the log() Arithmetic function returns the logarithm of x to the based of e

log(): In C programming Language,log() function is used to perform  calculate natural logarithm of significant value

Declaration

The Syntax of the log() function in C Programming language

double log(double x);

Parameters or Arguments

X is the parameter or argument of this function which is used in the calculation of the logarithm of x to the base of e

Returns

The log function returns the logarithm of x to the base of e

Required Header

In C Language, the required header file for log() function is

#include<math.h>

Example

The following example shows the usage of the log() function

Program 1

 

#include <stdio.h>
#include <math.h>

int main()
{
    double a=1.5,b=1.25;
    printf("log value of %f is: %f\n",a,log(a));
    printf("log value of %f is: %f\n",b,log(b));
    getch();
    return 0;
}

 

When above program me  is compiled it will produce the following result

log value of 1.500000 is: 0.405465

log value of 1.250000 is: 0.223144

 

program 2

#include <stdio.h>
#include <math.h>

int main()
{   //define the variable
    double logValue;
    double inputValue;
    //get input from user
    printf("Please enter the value to calculate log value :");
    scanf("%lf",&inputValue);
    //calculate the log value
    logValue=log(inputValue);
    //display the log value
     printf("\nlog value of %lf is %lf\n",inputValue,logValue);
    getch();
    return 0;
}

When above program me  is compiled it will produce the following result

please enter the value to calculate log value :1.5
log value of 1.500000 is 0.405465

 

Similar Functions

There are other functions similar to the pow() function in C programming language.

log10() function in C

sqrt() function in C

pow() function in C

 

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