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These functions are provided for obtaining the absolute value (or
magnitude) of a number. The absolute value of a real number
`x` is `x` is `x` is positive, -`x` if `x` is
negative. For a complex number `z`, whose real part is `x` and
whose imaginary part is `y`, the absolute value is ```
sqrt
(
```

.
`x`*`x` + `y`*`y`)

Prototypes for `abs`

and `labs`

are in ``stdlib.h'`;
`fabs`

and `cabs`

are declared in ``math.h'`.

__Function:__ int **abs** *(int number)*

This function returns the absolute value of `number`.

Most computers use a two's complement integer representation, in which
the absolute value of `INT_MIN`

(the smallest possible `int`

)
cannot be represented; thus, `abs (INT_MIN)`

is not defined.

__Function:__ long int **labs** *(long int number)*

This is similar to `abs`

, except that both the argument and result
are of type `long int`

rather than `int`

.

__Function:__ double **fabs** *(double number)*

This function returns the absolute value of the floating-point number
`number`.

__Function:__ double **cabs** *(struct { double real, imag; } z)*

The `cabs`

function returns the absolute value of the complex
number `z`, whose real part is

and whose
imaginary part is `z`.real

. (See also the function
`z`.imag`hypot`

in section Exponentiation and Logarithms.) The value is:

sqrt (z.real*z.real +z.imag*z.imag)

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