sqrt, sqrtl
Remonter à Math.h - Index
Header File
math.h
Category
Math Routines
Prototype
double sqrt(double x);
long double sqrtl(long double x);
Description
Calculates the positive square root.
sqrt calculates the positive square root of the argument x.
sqrtl is the long double version; it takes a long double argument and returns a long double result. Error handling for these functions can be modified through the functions _matherr and _matherrl.
Return Value
On success, sqrt and sqrtl return the value calculated, the square root of x. If x is real and positive, the result is positive. If x is real and negative, the global variable errno is set to
EDOM |
Domain error |
Example
#include <math.h>
#include <stdio.h>
int main(void)
{
double x = 4.0, result;
result = sqrt(x);
printf("The square root of %lf is %lf\n", x, result);
return 0;
}
Portability
POSIX | Win32 | ANSI C | ANSI C++ | |
---|---|---|---|---|
sqrt |
+ |
+ |
+ |
+ |
sqrtl |
+ |
+ |
+ |