sqrt, sqrtf
Visual Studio .NET 2003
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
Remarks
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.
Return Value
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 |
Requirements
| Routine | Required header | Compatibility |
|---|---|---|
| sqrt, sqrtf | <math.h> | ANSI, Win 98, Win Me, Win NT, Win 2000, Win XP |
For additional compatibility information, see Compatibility in the Introduction.
Libraries
All versions of the C run-time libraries.
Example
// crt_sqrt.c
/* This program calculates a square root. */
#include <math.h>
#include <stdio.h>
#include <stdlib.h>
int main( void )
{
double question = 45.35, answer;
answer = sqrt( question );
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
See Also
Floating-Point Support Routines | exp | log | pow | Run-Time Routines and .NET Framework Equivalents
