C log() function
C log() function - Calculate natural logarithm
Syntax:
double log(double x)
The log() function is used to calculate the natural logarithm (base e) of x.
Parameters:
Name | Description | Required /Optional |
---|---|---|
x | Value whose logarithm is to be found. | Required |
Return value from log()
- Upon successful completion, the function returns the natural logarithm of x.
Example: log() function
The following example shows the usage of log() function.
#include <math.h>
#include <stdio.h>
int main(void)
{
double x = 1.0, y;
y = log(x);
printf("The natural logarithm of %lf is %lf\n", x, y);
x = 10.0;
y = log(x);
printf("The natural logarithm of %lf is %lf\n", x, y);
x = 1000.0;
y = log(x);
printf("The natural logarithm of %lf is %lf\n", x, y);
}
Output:
The natural logarithm of 1.000000 is 0.000000 The natural logarithm of 10.000000 is 2.302585 The natural logarithm of 1000.000000 is 6.907755
C Programming Code Editor:
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C Programming: Tips of the Day
What's the point of const pointers?
const is a tool which you should use in pursuit of a very important C++ concept:
Find bugs at compile-time, rather than run-time, by getting the compiler to enforce what you mean.
Even though it does not change the functionality, adding const generates a compiler error when you're doing things you didn't mean to do. Imagine the following typo:
void foo(int* ptr) { ptr = 0;// oops, I meant *ptr = 0 }
If you use int* const, this would generate a compiler error because you're changing the value to ptr. Adding restrictions via syntax is a good thing in general. Just don't take it too far -- the example you gave is a case where most people don't bother using const.
Ref : https://bit.ly/33Cdn3Q
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