sqrt, sqrtf, sqrtl
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
);
long double sqrtl(
long double x
);
Parameters
- x
Non-negative floating-point value
Remarks
Because C++ allows overloading, you 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 functions return the square-root of x. By default, if x is negative, sqrt returns an indefinite NaN.
Input |
SEH Exception |
_matherr Exception |
|---|---|---|
± QNAN,IND |
none |
_DOMAIN |
- ∞ |
none |
_DOMAIN |
x<0 |
none |
_DOMAIN |
Requirements
Function |
C header |
C++ header |
|---|---|---|
sqrt, sqrtf, sqrtl |
<math.h> |
<cmath> |
For compatibility information, see Compatibility.
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 %f\n", answer );
else
printf( "The square root of %.2f is %.2f\n", question, answer );
}
The square root of 45.35 is 6.73