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()

﻿

Follow us on Facebook and Twitter for latest update.