C log Function

The C log function is one of the math functions, used to calculate the logarithmic value of the given number with base E. The syntax of the log in C Programming is

double log(double number);

C log Function Example

The C math logarithmic Function allows you to find the logarithmic value of base E. In this program, We are going to find the logarithmic value of different numbers, and display the output.

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

int main()
{
    printf("\n The Logarithmic Value of 0       = %.4f ", log(0));
    printf("\n The Logarithmic Value of 1       = %.4f ", log(1));
    
    printf("\n The Logarithmic Value of 5       = %.4f ", log(5));
    printf("\n The Logarithmic Value of 16.4    = %.4f ", log(16.4));
    
    printf("\n The Logarithmic Value of -9.32   = %.4f ", log(-9.32));  
    printf("\n The Logarithmic Value of -15.34  = %.4f ", log(-15.34));
  
    return 0;
}

In this C Programming example, we are allowing the user to enter their own number. Next, this program uses the log function to find the logarithmic value of the user-given number with base E.

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

int main()
{
    float num, logValue;

    printf(" Please Enter any Numeric :  ");
    scanf("%f", &num);
  
    logValue = log(num);
  
    printf("\n Logarithmic of %.2f = %.4f ", num, logValue);
  
    return 0;
}

 Please Enter any Numeric :  25.765

 Logarithmic of 25.76 = 3.2490