sqrt

Compute the square root of x.

Interface Definition

C interface:

float sqrtf(float x);

double sqrt(double x);

long double sqrtl(long double x);

Fortran interface:

RES = SQRTF(X);

RES = SQRT(X);

Parameters

Parameter	Type	Description	Input/Output
x	For sqrtf, x is of single-precision floating-point type. For sqrt, x is of double-precision floating-point type. For sqrtl, x is of long double-precision floating-point type.	Floating-point value of the input data.	Input

Return Value

If input x is ±0, the return value is ±0.
If input x is +∞, the return value is +∞.
If input x is -∞, the return value is NaN.
If input x is NaN, the return value is NaN.

Dependencies

C: "km.h"

Examples

C interface:

    // typical usage 
    double x1 = 1.0, x2 = 2.0, x3 = 3.0, x4 = 4.0; 
    // special handling 
    double a = 0.0, b = INFINITY, c = -INFINITY, d = NAN; 
    // print result 
        printf("sqrt(1.0) = %.15f\n", sqrt(x1)); 
        printf("sqrt(2.0) = %.15f\n", sqrt(x2)); 
        printf("sqrt(3.0) = %.15f\n", sqrt(x3)); 
        printf("sqrt(4.0) = %.15f\n", sqrt(x4)); 
        printf("sqrt(0.0) = %.15f\n", sqrt(a)); 
        printf("sqrt(INFINITY) = %.15f\n", sqrt(b)); 
        printf("sqrt(-INFINITY) = %.15f\n", sqrt(c)); 
        printf("sqrt(NAN) = %.15f\n", sqrt(d)); 
    /* 
     *  sqrt(1.0) = 1.000000000000000 
     *  sqrt(2.0) = 1.414213562373095 
     *  sqrt(3.0) = 1.732050807568877 
     *  sqrt(4.0) = 2.000000000000000 
     *  sqrt(0.0) = 0.000000000000000 
     *  sqrt(INFINITY) = inf 
     *  sqrt(-INFINITY) = -inf
     *  sqrt(NAN) = nan 
     * */

Fortran interface:

    REAL(8) :: X = 3.0 
    PRINT*,  SQRT(X) 
    ! 
    ! OUTPUT 
    !     1.732050807568877 
    !

Parent topic: Power and Root Functions