find_first_of() Function in C++

This C++ program demonstrates the find_first_of() algorithm. The function find_first_of() finds the first element from first container which exists in second container. The function takes four iterators – iterators to the beginning and end to the sequence containers.

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

```
/*
```

 * C++ program to demonstrate find_first_of algorithm

```
 */
```
```
#include <iostream>
```
```
#include <string>
```
```
#include <vector>
```
```
#include <algorithm>
```
```
#include <functional>
```
```
#include <iomanip>
```
```
using namespace std;
```
```
 
```
```
void print(char a[], int N)
```
```
{
```
```
    for(int i = 0; i < N; i++)
```
```
    {
```
```
        cout << setw(2) << a[i] << " ";
```
```
    }
```
```
    cout << endl;
```
```
}
```
```
 
```
```
int main()
```
```
{
```

    char a[] = {'a', 'e', 'i', 'o', 'u'};

    char b[] = {'z', 'y', 'd', 'e', 'f'};

    int alen = sizeof(a) / sizeof(char), blen = sizeof(b) / sizeof(char);

```
    char * i;
```
```
 
```
```
    cout << "Array a : ";
```
```
    print(a, alen);
```
```
    cout << "Array b : ";
```
```
    print(b, blen);
```
```
    // Without any predicate
```

    i = find_first_of(a, a + alen, b, b + blen);

    cout << "Iterator to first matching sequence : " << *i

```
         << endl;
```
```
    // With predicate less
```

    i = find_first_of(b, b + blen, a, a + alen, less<char>());

    cout << "Iterator to first character in b less than character in a : "

```
         << *i << endl;
```
```
}
```

$ a.out
Array a :  a  e  i  o  u 
Array b :  z  y  d  e  f 
Iterator to first matching sequence : e
Iterator to first character in b less than character in a : d

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

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