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transform() Function in C++

This C++ program illustrates the transform() algorithm. The program creates two vectors and transforms the third vector by inserting a value equal to an element from first vector raise to the power of element in second vector. The function power is passed as a predicate to the function transform().

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

```
/*
```

 * C++ Program to illustrate transform algorithm

```
 */
```
```
#include <iostream>
```
```
#include <algorithm>
```
```
#include <vector>
```
```
#include <functional>
```
```
#include <iterator>
```
```
#include <iomanip>
```
```
#include <cmath>
```
```
using namespace std;
```
```
 
```
```
typedef const vector <int>& vecref;
```
```
 
```
```
int power(int a, int b)
```
```
{
```
```
    return pow(a, b);
```
```
}
```
```
 
```

void print(vecref a, vecref b, vecref c)

```
{
```

    cout << "b[i]   a[i]    c[i]" << endl;

```
    for(int i = 0; i < a.size(); i++)
```
```
    {
```

        cout << setw(2) << setfill(' ') << a[i] << "   ^   "

             << setw(1) << setfill(' ') << b[i] << "   =  "

             << setw(2) << setfill(' ') << c[i] << endl;

```
    }
```
```
}
```
```
 
```
```
int main()
```
```
{
```
```
    vector <int> a(10), b(10), c(10);
```
```
 
```
```
    for (int i = 0; i < 10 ;i++)
```
```
    {
```
```
        a[i] = (i % 2 + 1);
```
```
        b[i] = (i % 3 + 1);
```
```
    }
```
```
    // Save the result in vector c
```

    cout << "Transform operation" << endl;

    transform(b.begin(), b.end(), a.begin(), c.begin(), power);

```
    print(b, a, c);
```
```
}
```

$ a.out
Transform operation
b[i]   a[i]    c[i]
 1   ^   1   =   1
 2   ^   2   =   4
 3   ^   1   =   3
 1   ^   2   =   1
 2   ^   1   =   2
 3   ^   2   =   9
 1   ^   1   =   1
 2   ^   2   =   4
 3   ^   1   =   3
 1   ^   2   =   1

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transform() Function in C++

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