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Showing content from https://www.tutorialspoint.com/cpp_standard_library/cpp_queue_operator_greater_than_or_equal_to.htm below:

C++ Queue Operator Greater Than or Equal To

The C++ std::queue::operator>= function for the queue is used to compare two queues. It checks whether the first queue is greater than or equal to the second queue based on the lexicographical comparison. It return a boolean value true if the first queue element is greater than or equal to the corresponding elements of the second queue. The time complexity of this function is linear i.e.O(n).

Following is the syntax for std::queue::operator>= function.

bool operator>= (const queue<T,Container>& q1, const queue<T,Container>& q2);

• q1 − It indicates the first queue object.
• q2 − It indicates the second queue object.

This function returns true if first queue is greater than or equal to second otherwise false.

Let's look the following example, where we are going to demonstrate the usage of operator>= function.

#include <iostream>
#include <queue>
int main()
{
    std::queue<int> a;
    std::queue<int> b;
    a.push(11);
    a.push(2);
    b.push(1);
    b.push(2);
    if (a >= b) {
        std::cout << "Queue1 is greater than or equal to Queue2." << std::endl;
    } else {
        std::cout << "Queue1 is less than Queue2." << std::endl;
    }
    return 0;
}

Output of the above code is as follows −

Queue1 is greater than or equal to Queue2.

Consider the following example, where we are going to initialize the queues with same elements and comparing them.

#include <iostream>
#include <queue>
int main()
{
    std::queue<int> a;
    std::queue<int> b;
    a.push(11);
    a.push(222);
    b.push(11);
    b.push(222);
    if (a >= b) {
        std::cout << "Queue1 is greater than or equal to Queue2." << std::endl;
    } else {
        std::cout << "Queue1 is less than Queue2." << std::endl;
    }
    return 0;
}

If we run the above code it will generate the following output −

Queue1 is greater than or equal to Queue2.

In the following example, we are going to initialize the queue with single element and comparing them.

#include <iostream>
#include <queue>
int main()
{
    std::queue<int> a;
    std::queue<int> b;
    a.push(1);
    b.push(2);
    if (a >= b) {
        std::cout << "Queue1 is greater than or equal to Queue2." << std::endl;
    } else {
        std::cout << "Queue1 is less than Queue2." << std::endl;
    }
    return 0;
}

Let us compile and run the above program, this will produce the following result −

Queue1 is less than Queue2.

Following is the example, where we are going to compare the empty queue and observing the output.

#include <iostream>
#include <queue>
int main()
{
    std::queue<int> a;
    std::queue<int> b;
    if (a >= b) {
        std::cout << "Queue1 is greater than or equal to Queue2." << std::endl;
    } else {
        std::cout << "Queue1 is less than Queue2." << std::endl;
    }
    return 0;
}

If we run the above code it will generate the following output −

Queue1 is greater than or equal to Queue2.

queue.htm

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