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		+	+	+