How to get the Index of Specified Element in an Array in C++ - Step by Step Examples

How to get the Index of Specified Element in an Array in C++ ?

Answer

To get the index of a specified element in an array in C++, you can use the std::find function from the header.


✐ Examples

1 Index of Element 30 in Integer Array

In this example,

  1. We include the header for using the std::find function.
  2. We create an integer array arr with values 10, 20, 30, 40, 50.
  3. We use the std::find function to find the iterator of element 30 in the array.
  4. If the element is found, we calculate its index using std::distance.
  5. If the element is not found, the iterator will point to arr.end().

C++ Program

#include <iostream>
#include <algorithm>
#include <vector>

int main() {
    std::vector<int> arr = {10, 20, 30, 40, 50};
    int specifiedElement = 30;

    auto it = std::find(arr.begin(), arr.end(), specifiedElement);

    if (it != arr.end()) {
        int index = std::distance(arr.begin(), it);
        std::cout << "Index of specified element " << specifiedElement << " is: " << index << std::endl;
    } else {
        std::cout << "Specified element not found in the array" << std::endl;
    }

    return 0;
}

Output

Index of specified element 30 is: 2

2 Index of Element 60 in Integer Array

In this example,

  1. We include the header for using the std::find function.
  2. We create an integer array arr with values 10, 20, 30, 40, 50.
  3. We use the std::find function to find the iterator of element 60 in the array.
  4. If the element is found, we calculate its index using std::distance.
  5. If the element is not found, the iterator will point to arr.end().

C++ Program

#include <iostream>
#include <algorithm>
#include <vector>

int main() {
    std::vector<int> arr = {10, 20, 30, 40, 50};
    int specifiedElement = 60;

    auto it = std::find(arr.begin(), arr.end(), specifiedElement);

    if (it != arr.end()) {
        int index = std::distance(arr.begin(), it);
        std::cout << "Index of specified element " << specifiedElement << " is: " << index << std::endl;
    } else {
        std::cout << "Specified element not found in the array" << std::endl;
    }

    return 0;
}

Output

Specified element not found in the array

Summary

In this tutorial, we learned How to get the Index of Specified Element in an Array in C++ language with well detailed examples.


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