sqrt ~ Online tutorial

sqrt, sqrtl

Calculates square root

Declaration:

Real:

double sqrt(double x);

long double sqrtl(long double @E(x));

Complex:

complex sqrt(complex x);

Remarks:

sqrt calculates the positive square root of the input value.

For complex numbers x, sqrt(x) gives the complex root whose arg is arg(x) /

2.The complex square root is defined by

sqrt(z) = sqrt(abs(z)) * ( cos(arg(z)/2) + i * sin(arg(z)/2) )

Return Value:

Real sqrt and sqrtl return the square root of x.

If x is real and positive, the result is positive.

If x is real and negative, sqrt sets errno to EDOM (domain error).

Error handling for real sqrt can be modified via matherr; for sqrtl, via

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;

}

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