log() : logarithm of x to the base e

#include <stdio.h>
int main() {
printf("\nNumber = %.2f", log(3.54)); // Number = 1.26
printf("\nNumber = %.2f", log(-3.12)); // Number = -nan
printf("\nNumber = %.2f", log(10)); // Number = 2.30
printf("\nNumber = %.2f", log(-1));// Number = -nan
printf("\nNumber = %.2f", log(0));// Number = -inf
return 0;
}
We will get log value of any number with base e by using log() function.
log(x) 
x = input number

Example

#include <stdio.h>
#include <math.h>
int main(void){
     double  x,ret;
     x=3.54;
     ret=log(x);
     printf("log(%.2f)=%.2f", x,ret);
     return 0;
}
The above code will give this output.
log(3.54)= 1.26

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