How to check if a Specific Item is present in the Set in C++ - Step by Step Examples

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How to check if a Specific Item is present in the Set in C++ ?

Answer

To check if a specific item is present in a Set in C++, you can use the find method.

✐ Examples

1 Check if Item is Present

In this example,

We define a set named mySet containing elements of a specific type.
We use the find method of the Set to check if a specific item is present.
The find method returns an iterator pointing to the found element if the item is present in the Set, otherwise it returns an iterator pointing to the end of the Set.
We compare the iterator with the end iterator to determine if the item is present.
Finally, we print the result to standard output.

C++ Program

#include <iostream>
#include <set>

int main() {
    // Define Set with items
    std::set<std::string> mySet = {"apple", "banana", "orange", "grape", "melon"};

    // Check if item is present
    std::string item = "banana";
    bool isPresent = mySet.find(item) != mySet.end();

    // Print result
    std::cout << "Is " << item << " present in the Set? " << (isPresent ? "true" : "false") << std::endl;
    return 0;
}

Output

Is banana present in the Set? true

2 Check if Item is Not Present

In this example,

We define a set named mySet containing elements of a specific type.
We use the find method of the Set to check if a specific item is not present.
The find method returns an iterator pointing to the found element if the item is present in the Set, otherwise it returns an iterator pointing to the end of the Set.
We compare the iterator with the end iterator to determine if the item is not present.
Finally, we print the result to standard output.

C++ Program

#include <iostream>
#include <set>

int main() {
    // Define Set with items
    std::set<std::string> mySet = {"apple", "banana", "orange", "grape", "melon"};

    // Check if item is not present
    std::string item = "peach";
    bool isNotPresent = mySet.find(item) == mySet.end();

    // Print result
    std::cout << "Is " << item << " not present in the Set? " << (isNotPresent ? "true" : "false") << std::endl;
    return 0;
}

Output

Is peach not present in the Set? true

Summary

In this tutorial, we learned How to check if a Specific Item is present in the Set in C++ language with well detailed examples.

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