What is the sqrt() function in D?

The sqrt() function in D returns the square root of a non-negative number.

The figure below shows the mathematical representation of the sqrt() function:

Figure 1: Mathematical representation of the sqrt() function

Note: We need to import std.math in our code to use the sqrt() function. We can import it with the following:
import std.math

Syntax

sqrt(number)
// The number should be floating, double, or real.

Parameter

sqrt() requires a non-negative number as a parameter.

Return value

sqrt() returns the square root of the number sent as a parameter.

Note:

  • If -0.0 , real.infinity , real.nan, or -real.nan is sent as a parameter, the function returns the parameter as it is.
  • If -real.infinity or number < 0.0 is sent as a parameter, the function returns -nan.

Working example

The code below shows the use of the sqrt() function in D.

import core.stdc.stdio;
import std.stdio;
//Header required for the function
import std.math;
int main()
{
    //Perfect square root
    writeln ("The value of sqrt(4.0) : ",sqrt(4.0));
    writeln ("The value of sqrt(0.0) : ",sqrt(0.0));
    writeln ("The value of sqrt(25.0) : ",sqrt(25.0));
    //Non-perfect square root
    writeln ("The value of sqrt(4.4) : ",sqrt(4.4));
    //Exceptional outputs
    writeln ("The value of sqrt(-0.0) : ",sqrt(-0.0));
    writeln ("The value of sqrt(real.infinity) : ",sqrt(real.infinity));
    writeln ("The value of sqrt(-real.infinity) : ",sqrt(-real.infinity));
    writeln ("The value of sqrt(real.nan) : ",sqrt(real.nan));
    writeln ("The value of sqrt(-real.nan) : ",sqrt(-real.nan));
    writeln ("The value of sqrt(-4.5) : ",sqrt(-4.5));
    return 0;
}

Explanation

  • Line 4: We add the std.math header required for the sqrt() function.

  • Lines 9 to 13: We calculate the square root value of the perfect square numbers 4, 0, and 25 using sqrt().

  • Line 16: We calculate the square root value of a non-perfect square number 4.4 using sqrt().

  • Lines 19 to 24: We calculate the square root value of exceptional numbers using sqrt().

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