find function c++ code example

Example 1: find function in c++

// find function for strings
// my linkedin : https://www.linkedin.com/in/vaalarivan-prasanna-3a07bb203/
str = "Ilayathapathy";
subStr = "thalapathy";
cout << str.find(subStr, 1);  // prints 5 (first occurrence of substring \n
// starting at index 1

Example 2: vector.find()

#include <algorithm>
#include <vector>

if ( std::find(vec.begin(), vec.end(), item) != vec.end() )
   do_this();
else
   do_that();

Example 3: c++ string contains

if (string1.find(string2) != std::string::npos) {
    std::cout << "found!" << '\n';
}

Example 4: c++ find string in string

#include <iostream>
#include <string>
#include <algorithm>
#include <functional>

int main()
{
    std::string in = "Lorem ipsum dolor sit amet, consectetur adipiscing elit,"
                     " sed do eiusmod tempor incididunt ut labore et dolore magna aliqua";
    std::string needle = "pisci";
    auto it = std::search(in.begin(), in.end(),
                   std::boyer_moore_searcher(
                       needle.begin(), needle.end()));
    if(it != in.end())
        std::cout << "The string " << needle << " found at offset "
                  << it - in.begin() << '\n';
    else
        std::cout << "The string " << needle << " not found\n";
}

Example 5: find in string c++

size_t find (const string& str, size_t pos = 0) const;