| Description |
The Sqrt function returns the square root of a Number.
The number must be a floating point type.
Special values are treated as follows:
| Infinity | : Infinity |
| -0 | : -0 |
| NaN (Not a Number) | : NaN |
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| Notes |
Warning : the square root of a negative number is an imaginary number. In Delphi, use the Math routines to handle these.
Sqrt should raise an EInvalidOp exception when the Number is negative. In practice, the author's PC crashed (running Windows ME) when attempted.
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| Related commands |
| Sqr |
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Gives the square of a number |
| Sum |
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Return the sum of an array of floating point values |
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| Example code : Find the square root of various values |
var
number, squareRoot : Extended;
begin
// The square root of 225 = 15
number := 225;
squareRoot := Sqrt(number);
ShowMessageFmt('Square root of %f = %f',[number, squareRoot]);
// The square root of 3.456 = 1.859...
number := 3.456;
squareRoot := Sqrt(number);
ShowMessageFmt('Square root of %7.3f = %12.12f',[number, squareRoot]);
// The square root of infinity is still infinity
number := Infinity;
number := Sqrt(number);
ShowMessageFmt('Square root of Infinity = %f',[number]);
end;
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| Show full unit code |
Square root of 225.0 = 15.0
Square root of 3.456 = 1.859032006180
Square root of Infinity = INF
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