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Harris Amjad

Grokking Modern System Design Interview for Engineers & Managers

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The ** sin()** function in D returns the sine of a number. To be more specific,

`sin()`

returns the sine of a number in radians.The illustration below shows the mathematical representation of the `sin()`

function.

$\sin (x)= \frac{\text {Length of the Opposite Side}}{ \text {Length of the Hypotenuse}}$

Notes:

`std.math`

is required for this function.- The
`sin()`

function only works for right-angled triangles.

```
sin(number)
//number can be real, float, or double.
```

This function requires a number that represents an angle (in radians) as the parameter. In order to convert degrees to radians, use the following formula:

```
radians = degrees * ( PI / 180 )
```

The `sin()`

function returns the sine of the number (in radians) that is sent as a parameter.

The code below shows how to use the `sin()`

function in D.

import core.stdc.stdio;import std.stdio;//header required for functionimport std.math;int main(){//positive number in radianswriteln("The value of sin(2.3) ", sin(2.3));// negative number in radianswriteln("The value of sin(-2.3) ", sin(-2.3));//converting the degrees angle into radians and then applying sin()// degrees = 90.0// PI = 3.14159265// result first converts degrees to radians then apply sindouble result=sin(90.0 * (PI / 180.0));writeln("The value of sin(90.0 * (PI / 180.0)) ", result);return 0;}

Code Sample

*Line 9*: We declare a positive number in radians.*Line 12*: We declare a negative number in radians.*Line 18*: We convert the degrees into radians and then apply the`sin()`

function. The variable`result`

first converts degrees to radians and then applies`sin()`

.*Line 19*: We display the result.

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Harris Amjad

Grokking Modern System Design Interview for Engineers & Managers

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