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sqrt (3)
  • >> sqrt (3) ( Solaris man: Библиотечные вызовы )
  • sqrt (3) ( FreeBSD man: Библиотечные вызовы )
  • sqrt (3) ( Русские man: Библиотечные вызовы )
  • sqrt (3) ( Linux man: Библиотечные вызовы )
  • sqrt (3) ( POSIX man: Библиотечные вызовы )
  •  

    NAME

    sqrt, sqrtf, sqrtl - square root function
     
    

    SYNOPSIS

    c99 [ flag... ] file... -lm [ library... ]
    #include <math.h>
    
    double sqrt(double x);
    

    float sqrtf(float x);
    

    long double sqrtl(long double x);
    

     

    DESCRIPTION

    These functions compute the square root of their argument x.  

    RETURN VALUES

    Upon successful completion, these functions return the square root of x.

    For finite values of x < -0, a domain error occurs and either a NaN (if supported) or an implementation-defined value is returned.

    If x is NaN, a NaN is returned.

    If x is ±0 or +Inf, x is returned.

    If x is -Inf, a domain error occurs and a NaN is returned.  

    ERRORS

    These functions will fail if:

    Domain Error

    The finite value of x is < -0 or x is -Inf.

    If the integer expression (math_errhandling & MATH_ERREXCEPT) is non-zero, the invalid floating-point exception is raised.

    The sqrt() function sets errno to EDOM if the value of x is negative.

     

    USAGE

    An application wanting to check for exceptions should call feclearexcept(FE_ALL_EXCEPT) before calling these functions. On return, if fetestexcept(FE_INVALID | FE_DIVBYZERO | FE_OVERFLOW | FE_UNDERFLOW) is non-zero, an exception has been raised. An application should either examine the return value or check the floating point exception flags to detect exceptions.

    An application can also set errno to 0 before calling sqrt(). On return, if errno is non-zero, an error has occurred. The sqrtf() and sqrtl() functions do not set errno.  

    ATTRIBUTES

    See attributes(5) for descriptions of the following attributes:

    ATTRIBUTE TYPEATTRIBUTE VALUE

    Interface StabilityStandard

    MT-Level

     

    SEE ALSO

    feclearexcept(3M), fetestexcept(3M), isnan(3M), math.h(3HEAD), attributes(5), standards(5)


     

    Index

    NAME
    SYNOPSIS
    DESCRIPTION
    RETURN VALUES
    ERRORS
    USAGE
    ATTRIBUTES
    SEE ALSO


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