# norm() function in C++ with Examples

The norm() function is defined in the complex header file. This function is used to return the squared magnitude of the complex number z.

Syntax:

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

Parameter:

• z: It represents the given complex number.

Return: It returns the squared magnitude of the complex number.

Below programs illustrate the above function:-

Example 1:-

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

Output:
```The norm of (5,12) is 169
```

Example 2:-

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

Output:
```The norm of (4,3) is 25
```

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