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C log10() function

C log10() function - Base 10 logarithm

Syntax:

double log10(double x)

The log10() function is used to calculate the base 10 logarithm of x.

Parameters:

Name Description Required /Optional
x Value whose logarithm is to be found. Required

Return value from log10()

  • Returns the computed value.

Example: log10() function

The following example calculates the base 10 logarithm of 100.0 and 1000.0.


#include <math.h>
#include <stdio.h>
 
int main(void)
{
   double x = 100.0, y; 
   y = log10(x); 
   printf("The base 10 logarithm of %lf is %lf\n", x, y);
   x = 1000.0; 
   y = log10(x); 
   printf("\nThe base 10 logarithm of %lf is %lf\n", x, y);
}
 

Output:

The base 10 logarithm of 100.000000 is 2.000000

The base 10 logarithm of 1000.000000 is 3.000000

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