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# Create your own abs() Macro/Function to get Absolute value in C++

**By: **IncludeHelp, **on ** 16 FEB 2017

Learn: How to get absolute value of any integer without using abs() function of stdlib.h in C, C++ programming language? Here, we will learn to create our own ABS() Macro/Function.

First of all, we should learn about abs() function

## What is abs()?

This is a library function which is declared in stdlib.h, it returns absolute value of any integer. **The real/actual magnitude of a number (numerical value) without sign is known as Absolute value**.

For example - if there is a value **-10** its absolute value will be **10**, and if the value is **10** its absolute value will also be **10**.

### Find absolute value using abs() - A stdlib.h library function

Consider the example, here we will find the absolute value by using abs() function.

#include <iostream>
#include <stdlib.h>
using namespace std;
int main()
{
int val;
val=-10;
cout<<"Absolute value of "<<val<<" is "<<abs(val)<<endl;
val=10;
cout<<"Absolute value of "<<val<<" is "<<abs(val)<<endl;
return 0;
}

Output

Absolute value of -10 is 10
Absolute value of 10 is 10

### Find absolute value without using abs() - *by using our own ABS() function*

Here, we will not use library function abs(), we are using two methods to get the absolute value of any integer number.

- Using
**Parameterized Macro**
- Using
**User Define Function**

#### 1) Parameterized Macro

Here is the statement of Parameterized Macro

#define ABS(N) ((N<0)?(-N):(N))

**Example:**

#include <iostream>
using namespace std;
#define ABS(N) ((N<0)?(-N):(N))
int main()
{
int val;
val=-10;
cout<<"Absolute value of "<<val<<" is "<<ABS(val)<<endl;
val=10;
cout<<"Absolute value of "<<val<<" is "<<ABS(val)<<endl;
return 0;
}

Output

Absolute value of -10 is 10
Absolute value of 10 is 10

#### 2) User Define Function

Here is the function body of the ABS() - A user define function, that will take an integer number and return absolute value.

**Example: function code**

int ABS(int N)
{
return ((N<0)?(-N):(N));
}

This is not only a C++ programming trick to get absolute values, we can also use it in C programming too.

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