How to check if a Set is Not Empty in C++

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How to check if a Set is Not Empty in C++ ?

Answer

In C++, you can use the empty() method of the standard library's Set container to check if it's not empty.

✐ Examples

1 Check if Set is Not Empty

In this example,

We declare a Set using the std::set container from the C++ standard library and initialize it with some elements.
We use the empty() method on the Set to determine if it contains any elements.
If the Set is not empty, the empty() method returns false; otherwise, it returns true.
We print the result to the standard output to indicate whether the Set is not empty or not.

C++ Program

#include <iostream>
#include <set>

int main() {
    std::set<int> mySet = {1, 2, 3}; // Or std::set<int> mySet;
    if (!mySet.empty()) {
        std::cout << "The Set is not empty\n";
    } else {
        std::cout << "The Set is empty\n";
    }
    return 0;
}

Output

The Set is not empty

2 Check if Empty Set is Not Empty

In this example,

We declare an empty Set using the std::set container.
We use the empty() method on the Set to determine if it contains any elements.
Since the Set is empty, the empty() method returns true.
We print the result to the standard output to indicate that the Set is indeed empty.

C++ Program

#include <iostream>
#include <set>

int main() {
    std::set<int> emptySet;
    if (!emptySet.empty()) {
        std::cout << "The Set is not empty\n";
    } else {
        std::cout << "The Set is empty\n";
    }
    return 0;
}

Output

The Set is empty

Summary

In this tutorial, we learned How to check if a Set is Not Empty in C++ language with well detailed examples.

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How to check if a Set is Not Empty in C++

How to check if a Set is Not Empty in C++ ?

Answer

✐ Examples

1 Check if Set is Not Empty

C++ Program

Output

2 Check if Empty Set is Not Empty

C++ Program

Output

Summary

More C++ Sets Tutorials