std::find in C++

Difficulty Level : Easy
Last Updated : 17 Feb, 2020

Finds the element in the given range of numbers. Returns an iterator to the first element in the range [first,last) that compares equal to val. If no such element is found, the function returns last.

Function Template :

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InputIterator find (InputIterator first, InputIterator last, const T& val)
first,last :
Input iterators to the initial and final positions in a sequence. The range
searched is [first,last), which contains all the elements between first and
last, including the element pointed by first but not the element pointed by last.

val :
Value to be search in the range
Return Value :
An iterator to the first element in the range that compares equal to val.
If no elements match, the function returns last.

Examples:

Input : 10 20 30 40
Output : Element 30 found at position : 2 (counting from zero)  

Input : 8 5 9 2 7 1 3 10
Output : Element 4 not found.

// CPP program to illustrate 
// std::find
// CPP program to illustrate 
// std::find
#include<bits/stdc++.h>
  
int main ()
{
    std::vector<int> vec { 10, 20, 30, 40 };
      
    // Iterator used to store the position 
    // of searched element
    std::vector<int>::iterator it;
      
    // Print Original Vector
    std::cout << "Original vector :";
    for (int i=0; i<vec.size(); i++)
        std::cout << " " << vec[i];
          
    std::cout << "\n";
      
    // Element to be searched
    int ser = 30;
      
    // std::find function call
    it = std::find (vec.begin(), vec.end(), ser);
    if (it != vec.end())
    {
        std::cout << "Element " << ser <<" found at position : " ;
        std::cout << it - vec.begin() << " (counting from zero) \n" ;
    }
    else
        std::cout << "Element not found.\n\n";
          
    return 0;
}

Output:

Original vector : 10 20 30 40
Element 30 found at position : 2 (counting from zero)

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std::find in C++