find_if() Function in C++

This C++ program demonstrates the find_if algorithm on string vector. The find_if takes three arguments – of which the first two are iterators to the beginning and end of the container and the third argument is predicate. The predicate we are passing returns true on strings starting with ‘P’.

Here is the source code of the C++ program demonstrates the find_if algorithm on string vector. The C++ program is successfully compiled and run on a Linux system. The program output is also shown below.

```
/*
```

 * C++ Program to demonstrate find_if() on string vector

```
 */
```
```
#include <iostream>
```
```
#include <algorithm>
```
```
#include <string>
```
```
#include <vector>
```
```
 
```
```
bool fun(std::string s)
```
```
{
```
```
    if(s[0] == 'P')
```
```
        return true;
```
```
    else 
```
```
        return false;
```
```
}
```
```
 
```
```
int main()  
```
```
{
```

    std::vector <std::string>::iterator i;

```
    std::vector <std::string> v;
```
```
    v.push_back("Apple");
```
```
    v.push_back("Apricot");
```
```
    v.push_back("Kiwi");
```
```
    v.push_back("Orange");
```
```
    v.push_back("Peach");
```
```
    v.push_back("Pineapple");
```
```
 
```

    i = find_if(v.begin(), v.end(), fun);

```
    if (i != v.end())
```
```
    {
```

        std::cout << "String at position " << (i - v.begin() + 1)

                  << " starts with P" << std::endl;

        std::cout << "The string is : \"" << *i

```
                  << "\"" << std::endl;
```
```
    }
```
```
    return 0;
```
```
}
```

$ a.out
String at position 5 starts with P
The string is : "Peach"

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

Subscribe Now: C++ Programs Newsletter | Important Subjects Newsletters

If you wish to look at all C++ Programming examples, go to C++ Programs.

« Prev - find() Function in C++

» Next - find_first_of() Function in C++

Next Steps:

Get Free Certificate of Merit in C++ Programming
Participate in C++ Programming Certification Contest
Become a Top Ranker in C++ Programming
Take C++ Programming Tests
Chapterwise Practice Tests: Chapter 1, 2, 3, 4, 5, 6, 7, 8, 9, 10
Chapterwise Mock Tests: Chapter 1, 2, 3, 4, 5, 6, 7, 8, 9, 10

Related Posts:

Buy C++ Books
Practice Computer Science MCQs
Apply for Computer Science Internship
Apply for Information Technology Internship
Apply for C++ Internship

Recommended Articles: