In this C++ tutorial, you will learn how to find the arc sine of a value using asin() function of cmath, with syntax and examples.
C++ asin()
C++ asin() returns inverse sine a number in radians.
Syntax
The syntax of C++ asin() is
asin(x)
where
| Parameter | Description |
|---|---|
| x | A double, float, or long double number. The allowed range of x is [-1, 1] |
Returns
The return value depends on the type of value passed for parameter x. The return value of asin(x) is
- double if x is double.
- float if x is float.
- long double if x is long double.
The synopsis of asin() function is
double asin(double x); float asin(float x); long double asin(long double x); double asin(T x); // for integral type argument values
asin() is a function of cmath library. Include cmath library in the program, if using asin().
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Example
In this example, we read x value from the user and find the inverse sine of this value using asin() function.
C++ Program
#include <iostream>
#include<cmath>
using namespace std;
int main() {
double x;
cout << "Enter a value : ";
cin >> x;
double result = asin(x);
cout << "asin(" << x << ") : " << result << " radians" << endl;
} Output
Enter a value : 1 asin(1) : 1.5708 radians Program ended with exit code: 0
Enter a value : 0.5 asin(0.5) : 0.523599 radians Program ended with exit code: 0
Conclusion
In this C++ Tutorial, we learned the syntax of C++ asin(), and how to use this function to find the inverse sine of a given value, with the help of examples.