abs, _abs64
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# abs, _abs64

Visual Studio .NET 2003

Calculates the absolute value.

```int abs(
int n
);
long abs(
long n
);   // C++ only
double abs(
double n
);   // C++ only
long double abs(
long double n
);   // C++ only
float abs(
float n
);   // C++ only
__int64 _abs64(
__int64 n
);
```

n
Integer value.

#### Return Value

The abs function returns the absolute value of its parameter. There is no error return.

#### Remarks

C++ allows overloading, so you can call overloads of abs. In a C program, abs always takes and returns an int.

#### Requirements

Routine Required header Compatibility
abs <stdlib.h> or <math.h> ANSI, Win 98, Win Me, Win NT, Win 2000, Win XP
__abs64 <stdlib.h> Win 98, Win Me, Win NT, Win 2000, Win XP

For additional compatibility information, see Compatibility in the Introduction.

Libraries

All versions of the C run-time libraries.

#### Example

This program computes and displays the absolute values of several numbers.

```// crt_abs.c
#include  <stdio.h>
#include  <math.h>
#include  <stdlib.h>

int main( void )
{
int    ix = -4, iy;
long   lx = -41567L, ly;
double dx = -3.141593, dy;
__int64 wx = -1, wy;

wy = _abs64( wx );
printf( "The absolute value of %I64x is %I64x\n", wx, wy);

iy = abs( ix );
printf( "The absolute value of %d is %d\n", ix, iy);

ly = labs( lx );
printf( "The absolute value of %ld is %ld\n", lx, ly);

dy = fabs( dx );
printf( "The absolute value of %f is %f\n", dx, dy );
}
```

#### Output

```The absolute value of ffffffffffffffff is 1
The absolute value of -4 is 4
The absolute value of -41567 is 41567
The absolute value of -3.141593 is 3.141593
```