generate_n() Function in C++

This C++ program demonstrates the generate_n() algorithm which saves the values generated by a function into a container. The program utilizes the generate_n() algorithm which is slightly different from generate() algorithm where it takes three parameters – pointer to the location where generated values will be saved, the number of values to be generated and the generating function. The generated values are then copied to the std::ostream.

Here is the source code of the C++ program which demonstrates the generate_n() algorithm. The C++ program is successfully compiled and run on a Linux system. The program output is also shown below.

```
/*
```

 * C++ Program to Demonstrate the generate_n() Algorithm

```
 */
```
```
#include <iostream>
```
```
#include <algorithm>
```
```
#include <iterator>
```
```
using namespace std;
```
```
 
```
```
static int i = 1; 
```
```
int ret() {
```
```
	return i++;
```
```
}
```
```
 
```
```
int main() {
```
```
    const std::size_t N = 10;
```
```
    int arr[N];
```
```
 
```
```
    std::generate_n(arr, N, ret);
```
```
    std::cout << "arr: ";
```

    std::copy(arr, arr+N, std::ostream_iterator<int>(std::cout, " "));

```
    std::cout << "\n";
```
```
}
```

$ gcc test.cpp
$ a.out
Vector v : 1 2 3 4 5 6 7 8 9 10

Sanfoundry Global Education & Learning Series – 1000 C++ Programs.

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