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

C++ Stack::operator<= Function

The stack is a fundamental data structure that follows the LIFO(Last-In-First-Out) manner, meaning that the last added element will be removed first.

The C++ function std::stack::operator<= compares the two stacks, determining if the first stack is less than or equal to the second stack. It evaluates the stacks size and elements wise comparisons to determine the relationship.

Following is the Syntax for std::stack::operator<= function −

bool operator<=(const stack <Type, Container>& left, const stack <Type, Container>& right);

• left − An object of type stack.
• right − An object of type stack.

It return true if the stack on the leftside is lessthan or equal to stack on the right side, otherwise false.

Let's look at the following where we are going to compare the elements inside the stack using the <= operator.

#include <iostream>
#include <stack>

int main(){
   std::stack<int> x;
   x.push(1);
   x.push(2);
   x.push(3);
   if (x.top() <= 5) {
      std::cout << "Elements are Lessthan Or Equal to 5";
   } else {
      std::cout << "Elements are Greaterthan 5";
   }
   return 0;
}

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

Elements are Lessthan Or Equal to 5

Considering the following example, where we are going to compare the size of the two stacks.

#include <iostream>
#include <stack>

int main(){
   std::stack<int> x, y;
   x.push(11);
   x.push(25);
   y.push(16);
   if (x.size() <= y.size()) {
      std::cout << "X is Lessthan Or Equal To Y";
   } else {
      std::cout << "X Has More Elements Compared To Y";
   }
   return 0;
}

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

X Has More Elements Compared To Y

In the following example, we are going to check if one stack is empty or lessthan or equal to another stack.

#include <iostream>
#include <stack>

int main(){
   std::stack<int> a, b;
   a.push(12);
   if (a.empty() || a <= b) {
      std::cout << "True";
   } else {
      std::cout << "False";
   }
   return 0;
}

Output of the above code is as follows −

False

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