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# sqrt, sqrtf

Visual Studio 2005

Calculates the square root.

double sqrt(
double x
);
float sqrt(
float x
);  // C++ only
long double sqrt(
long double x
);  // C++ only
float sqrtf(
float x
);

#### Parameters

x

Nonnegative floating-point value

C++ allows overloading, so users can call overloads of sqrt that take float or long double types. In a C program, sqrt always takes and returns double.

The sqrt function returns the square-root of x. If x is negative, sqrt returns an indefinite, by default.

Input SEH Exception Matherr Exception

± QNAN,IND

none

_DOMAIN

- ∞

INVALID

_DOMAIN

x>0

INVALID

_DOMAIN

sqrt, sqrtf

<math.h>

ANSI, Windows 95, Windows 98, Windows 98 Second Edition, Windows Millennium Edition, Windows NT 4.0, Windows 2000, Windows XP Home Edition, Windows XP Professional, Windows Server 2003

For additional compatibility information, see Compatibility in the Introduction.

// crt_sqrt.c
// This program calculates a square root.

#include <math.h>
#include <stdio.h>
#include <stdlib.h>

int main( void )
{

if( question < 0 )
printf( "Error: sqrt returns %.2f\n, answer" );
else
printf( "The square root of %.2f is %.2f\n", question, answer );
}

#### Output

The square root of 45.35 is 6.73