What is asin() in D?
The asin() function, also called the arc sine function, returns the inverse sine of a number. To be more specific, it returns the inverse sine of a number in radians.
The figure below shows the mathematical representation of the asin() function.
Note:
std.mathis required for this function.
To convert radians to degrees, use the following formula:
degrees = radians * ( 180.0 / PI )
Syntax
asin(number)
//number can be real, float, or double.
Parameters
This function requires a number as a parameter. The parameter must be a value between -1 and 1.
-
-1 <= parameter <= 1.
-
If the value is outside -1 <= parameter <= 1, then
asin()returns-NaN.
Return value
asin() returns the inverse sine of the number that is sent as a parameter in radians. The return value lies in the interval [-PI/2, PI/2] radians.
Code
The code below demonstrates how to use the asin() function in D.
import core.stdc.stdio;
import std.stdio;
//header required for function
import std.math;
int main() {
//positive number in radians
writeln("The value of asin(0.5): ",asin(0.5) ," Radians");
// negative number in radians
writeln("The value of asin(-0.5): ",asin(-0.5) ," Radians");
//applying asin() and then converting the result in radians to degrees
// radians = 0.5
// PI = 3.14159265
double result=asin(0.5) * (180.0 / PI);
writeln("The value of asin(0.5): ",result," Degrees");
//error output
writeln("The value of asin(1.5): ",asin(1.5));
writeln("The value of asin(-1.5): ",asin(-1.5));
return 0;
}Explanation
- In lines 8 and 11, we use the
asin()function to convert0.5toradians. - In line 17, we use the
asin()function to convertresultintodegree. - In lines 20 and 21, we use the
asin()function to show errornan.
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