What is acos() in D?
The acos() function, also called the arc cosine function, returns the inverse cosine of a number. To be more specific, acos() returns the inverse cosine of a number in radians.
The image below shows the mathematical representation of the acos() function.
Note:
std.mathis required for this function.
To convert radians to degrees, use the following formula:
degrees = radians * ( 180.0 / PI )
Syntax
acos(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
acos()returns-NaN.
Return value
acos() returns the inverse cosine of a number (in radians) that is sent as a parameter. The return value lies in the interval [0, pi] radians.
Code
The following code shows how to use the acos() 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 acos(0.5): ",acos(0.5) ," Radians");
// negative number in radians
writeln("The value of acos(-0.5): ",acos(-0.5) ," Radians");
//applying acos() and then converting the result in radians to degrees
// radians = 0.5
// PI = 3.14159265
double result=acos(0.5) * (180.0 / PI);
writeln("The value of acos(0.5): ",result," Degrees");
//error output
writeln("The value of acos(1.5): ",acos(1.5));
writeln("The value of acos(-1.5): ",acos(-1.5));
return 0;
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