C acos() function
C acos() function - Calculate arccosine
The acos() function is used to calculate the arccosine of a given number, expressed in radians, in the range 0 to pi.
Syntax:
double acos(double x)
Parameters:
Name | Description | Required /Optional |
---|---|---|
x | Value whose arccosine is to be calculated. | Required |
Return value from acos()
- Upon successful completion, the function return the arc cosine of x.
- The value of x must be between -1 and 1 inclusive.
Example: acos() function
The following example shows the usage of acos() function.
#include <stdio.h>
#include <stdlib.h>
#include <math.h>
#define MAX 1.0
#define MIN -1.0
int main(void)
{
double x, y;
printf("Input the value of x: ");
scanf( "%lf", &x );
y = acos(x);
if (x > MAX)
printf( "Error: %lf not in the range!\n", x );
else if (x < MIN)
printf( "Error: %lf not in the range!\n", x );
else
printf("acos(%lf) = %lf\n", x, y);
}
Output:
Input the value of x: 1 acos(1.000000) = 0.000000 Input the value of x: 1.5 Error: 1.500000 not in the range! Input the value of x: -1.5 Error: -1.500000 not in the range!
C Programming Code Editor:
Previous C Programming: C math.h Home
Next C Programming: C asin()
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
- Weekly Trends
- Java Basic Programming Exercises
- SQL Subqueries
- Adventureworks Database Exercises
- C# Sharp Basic Exercises
- SQL COUNT() with distinct
- JavaScript String Exercises
- JavaScript HTML Form Validation
- Java Collection Exercises
- SQL COUNT() function
- SQL Inner Join
- JavaScript functions Exercises
- Python Tutorial
- Python Array Exercises
- SQL Cross Join
- C# Sharp Array Exercises