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() is used to perform calculate natural logarithm of significant value
Declaration
The Syntax of the log() 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 this Language, the required header file for log() is
#include<math.h>
log function in C
Example
The following example shows the usage of the log()
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
Other C programming language functions that are similar to the cosine function
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