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C++ cmath asin() function

❮ Math Functions

Example

Return the arcsine of different numbers:

cout << asin(0.64);
cout << asin(-0.4);
cout << asin(0);
cout << asin(1);
cout << asin(-1);
cout << asin(2);
Try it Yourself »

Definition and Usage

The asin() function returns the arcsine of a number in radians.

The asin() function is defined in the <cmath> header file.

Syntax

One of the following:

asin(double number);
asin(float number);

Parameter Values

Parameter Description
number Required. A number to find the arcsine of, in the range -1 to 1. If the value is outside -1 to 1, it returns NaN (Not a Number).
If the number is an integer type then it will be treated as a double.

Technical Details

Returns: A float value (if the argument is float) or double value (in any other case) representing the arcsine of a number.

❮ Math Functions