15. 15. Explain how a stack is used to evaluate the RPN expressions from Exercise 13. 1. a) 12 8 3 1 + -/ 2. b) 5 2+2 x 1 + 2x 3. c) 357+21-X 1++
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- 54. What is the difference between the top and pop operations of a stack? Group of answer choices The top operation removes the top item of the stack. The pop operation returns a reference to the top item on the stack and remove it. The top operation removes the top item of the stack. The pop operation returns a reference to the top item on the stack without removing it. The pop operation removes the top item of the stack. The top operation returns a reference to the top item on the stack without removing it. The pop and top operations are doing the same thing which removes the top item of the stack. The pop operation removes the top item of the stack. The top operation returns a reference to the top item on the stack and remove it.4. Sort elements in an array-based stack in ascending order, i.e. make the smallest element to be the top element of the stack. E.g. given the stack elements (from bottom to top): 90, 70, 80, 10, sort the elements to make the stack elements become (from bottom to top): 90, 80, 70, 10. The only data structure you can use is array-based stack. In addition to the given stack, you can use only one extra stack to store some temporary data. Given a stack st, use one extra stack, tmpst, to store temporary data. Here are some hints of the idea. Pop out the top element of st to a variable tmp. If the stack tmpst is empty, push tmp onto tmpst; if tmpst is not empty, pop out its top element and push that element onto st until the top element of tmpst is smaller than tmp, then push tmp onto tmpst .. a. Write a program to implement the stack based sorting. b. Take the input (90, 70, 80, 10) as an example. c. Print all the push and pop operations in proper format. d. At the end, print the sorted…Question3. Using the Stack class implemented in JAVA, write a JAVA code to do the following: a. Create an array of integers containing the following elements: 5, -1, 7,8,9,4,15 b. Create an empty stack (call it nums) and push all the array elements onto the stack. c. Using a temporary stack to reverse the content of the stack nums then print it. d. Display all odd elements from the stack nums.
- PP 12.4 This chapter's array implementation keeps the top variable pointing to the next array position above the actual top of the stack. Rewrite the array implementation such that stack[top] refers to the stack's true top. PP 12.5 A drop-out stack is a data structure that acts just like a stack except that if the stack size is n, and the n + 1 element is pushed, the first element is lost. Using an array, create a drop-out stack. (Hint: A circular array implementation would be appropriate.)question 1 Write a program to evaluate a postfix expression. Input: a postfix expression. E.g. 3 5 + Output: the result of the expression. E.g. the result for the above input is 8. Note: You must use the stack to implement this task. And please give the stack solutions for both the following implementations: Implement the array-based stack Implement the pointer-based stack Test your program using the following expressions: 3 5 + 3 5 + 6 * 3 5 6 + * 3 5 6 * 8 - 2 / + 12 20 + 16 / do not copy from chegg and do in c++23. If a stack contained the entries 128, 90, 56, 341 (from top to bottom), what would be at the top of thestack after the statement push(106) is executed?
- 1. a) Using the stack diagram, convert the following infix expression to a postfix expression. A* (B – C + D) – E / F b) Referring to question 1 (a), give the value of postfix expression by using the stack concept if provided: A=2, B=3, C=8, D=10, E=10 and F=21 : 2 O Implementing Stack In this part, you will implement a growable stack using arrays in C++. You start with an array of size = 1. Every time the stack gets full, you copy the data to an array of double the previous size, and the new array now represents the stack. To do so, you will have to use a dynamic array (using pointers) and allocate memory using the new operator. • Write a C++ class MyStack in file MyStack.cpp that implements the above stack with follow- ing public methods. - void push(int item) : Pushes the item onto the top of the stack. - int pop() : Removes the element at the top of the stack and returns it. - int peek() : Returns the top element without removing from top of the stack. bool empty() : Returns true is the stack is empty and false otherwise. All other methods or variables in your implementation should be private.C++: implement a stack based prefix expression evaluator using code below. Complete the evaluatePrefix function so that it will accept a string that is an expression in prefix notation and evaluates it to return the result. #include #include #include using namespace std; double evaluatePrefix (string expr) { stack < double >Stack; for (int j = expr.size () - 1; j >= 0; j--) { // if jth character is the delimiter ( which is // space in this case) then skip it if (expr[j] == ' ') continue; // Push operand to Stack // To convert expr[j] to digit subtract // '0' from expr[j]. if (isdigit (expr[j])) { // there may be more than // one digit in a number double num = 0, i = j; while (j < expr.size () && isdigit (expr[j])) j--; j++; // from [j, i] expr contains a number for (int k = j; k
- Q1.(b)“A queue can be implemented with two stacks, a stack can also be implemented using two queues", Justify the statement.2. a) Using the stack diagram, convert the following infix expression to a postfix expression. A*(B + C* (D - E) ) / F b) Referring to question 2 (a), give the value of postfix expression by using the stack concept if provided: A=4, B=3, C=6, D=10, E=2 and F=4Assume the function: void F(stack &S){ } and we send a stack S to the function F, as a result of it Select one: a. Both (copy constructor and destructor) should be called b. Destructor should be called O c. Copy constructor should be called d. Both (copy constructor and destructor) should not be called