## C++ asin()

Last Updated On Thursday 21st Apr 2022

## asin 2

The C++ asin() function returns the inverse sine of a number in radian.It is defined in <cmath> header file.

### Syntax

	asin(x)



### Parameters

The asin() function takes a one argument in the range [-1, 1].

Because the value of sine is in the range of 1 and -1. If the argument is out of this interval, a domain error occurs.

### Return value

The asin() function returns the value in the range of [-π/2, π/2].

• double if x is double.
• float if x is float.
• long double if x is long double.

### asin() prototype [As of C++ 11 standard]

	double asin(double x);
float asin(float x);
long double asin(long double x);
double asin (T x);



## asin example

### Example 1: C++ asin()

	#include <stdio.h>
#include <math.h>

#define PI 3.14159265

int main () {
double param, result;
param = 0.44;
result = asin(param) * 180.0 / PI;
printf ("The arc sine of %f is %f degrees\n", param, result);
return 0;
}



Output

	The arc sine of 0.440000 is 26.103881 degrees



### Example 2: C++ asin() ( Argument greater than 1 )

If the argument is greater than 1 or less than -1, asin() returns NaN i.e. not a number.

	#include <stdio.h>
#include <math.h>

#define PI 3.14159265

int main () {
double param, result;
param = 4.4;
result = asin(param) * 180.0 / PI;
printf ("The arc sine of %f is %f degrees\n", param, result);
return 0;
}



Output

• The Above Code returns NaN (Not a Number)
	The arc sine of 4.400000 is nan degrees