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!
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