# abs, _abs64

Visual Studio 2010

Updated: September 2010

Calculate 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

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

Note

Both abs(INT_MIN) and _abs64(INT_MIN) return a value of INT_MIN. Although this is the only time that abs and _abs64 return a negative value, it means that abs and _abs64 cannot be used to guarantee a positive value.

Routine

abs

<math.h>

_abs64

<stdlib.h>

## Example

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

```// crt_abs.c
// This program demonstrates the user of the abs function
// by computing and displaying the absolute values of
// several numbers.

#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;

// absolute 64 bit integer value
wy = _abs64( wx );
printf_s( "The absolute value of %I64x is %I64x\n", wx, wy);

// absolute 32 bit integer value
iy = abs( ix );
printf_s( "The absolute value of %d is %d\n", ix, iy);

// absolute long integer value
ly = labs( lx );
printf_s( "The absolute value of %ld is %ld\n", lx, ly);

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

Date

History

Reason

September 2010