# abs() function for complex number in c++

The abs() function for complex number is defined in the complex header file. This function is used to return the absolute value of the complex number z.

Syntax:

```template<class T> T abs (const complex<T>& z);
```

Parameter:

• z: It represents the given complex number.

Return: It returns the absolute value of the complex number.

Below programs illustrate the above function:-

Example 1:-

 `// C++ program to demonstrate ` `// example of abs() function. ` `  `  `#include ` `using` `namespace` `std; ` `  `  `// driver function ` `int` `main () ` `{ ` `  ``// defines the complex number: (5.0+12.0i) ` `  ``complex<``double``> complexnumber (5.0, 12.0); ` `  `  `  ``// prints the absolute value of the complex number ` `  ``cout << ``"The absolute value of "` `<< complexnumber << ``" is: "``; ` `  ``cout << ``abs``(complexnumber) << endl; ` `  `  ` ``return` `0; ` `} `

Output:

```The absolute value of (5,12) is: 13
```

Example 2:-

 `// C++ program to demonstrate ` `// example of abs() function. ` ` `  `#include ` `using` `namespace` `std; ` ` `  `// driver function ` `int` `main () ` `{ ` `  ``// defines the complex number: (4.0+3.0i) ` `  ``complex<``double``> complexnumber (4.0, 3.0); ` ` `  `  ``// prints the absolute value of the complex number ` `  ``cout << ``"The absolute value of "` `<< complexnumber << ``" is: "``; ` `  ``cout << ``abs``(complexnumber) << endl; ` ` `  ` `  `  ``return` `0; ` `} `

Output:

```The absolute value of (4,3) is: 5
```

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