Question

1. Using existing Stack Java Collection Framework, write Java Code segment to do the following.   You may write this in jGrasp
   1. Create a Stack of String called, myStacks

2. Read input from keyboard, 10 names and then add to myStacks

3. As you remove each name out, you will print the name in uppercase along with a number of characters the name has in parenthesis. (one name per line).  
   e.g.     Kennedy (7)

2. Using existing Stack Java Collection Framework, write Java Code segment to do the following.   You may write this in jGrasp
   1. Create a Stack of Integer called, myScores

2. Read input from keyboard, you will ask the user to enter 5 integer-scores and then add to myScores

3. In the end, you will remove each score and print on the screen, TAB separated. Then print sum and average of all 5 numbers.
   

ENHANCE this part by allowing the user to enter as many scores as they want, until they enter -1 to stop.

3. Show the effect of the following stack operations (step-by-step), assuming you begin with an empty stack.

push   2

push   3

push   1

pop

pop

push   5

push   4

pop

push   6

push   9

push   7

pop

push   1

pop

pop

Note that because we are typing information so use left side line to be the bottom of your stack

Show stack (left side is bottom of the stack)

Show what is written by the following segment of code (i.e. output on the screen), given that item1, item2, and item3 are int variables, and stack is an object that fits our abstract description of a stack.  
(Assume that you can store and retrieve variables of type int on stack.)

int item1 = 4;

int item2 = 2;

int item3 = -3;

stack.push(item2);

stack.push(item1);

stack.push(item1 + item3);

item2 = stack.peek();

stack.push (item3 - item3);

stack.push(item2);

item1 = stack.peek();

stack.push(item1 + item3);

stack.push(3);

item1 = stack.pop();

System.out.println(item1 + " " + item2 + " " + item3);

while (!stack.empty())

{

item1 = stack.pop();

System.out.println(item1);

}

	Output on the screen:

Answer 1

Answer for part 1

import java.util.*; 
import java.io.*; 
  
public class Main { 
    public static void main(String args[]) 
    { 
        Stack<String> myStacks = new Stack<String>(); 
        Scanner sc = new Scanner(System.in);
        for(int i=0;i<2;i++){
            System.out.print("Enter Name:");
            String name = sc.nextLine();
            myStacks.push(name); 
        }
        
        System.out.println("\nThe names and their lengths are: ");
        while(!myStacks.empty()){
            String name = myStacks.pop().toString();
            System.out.println("Name:"+name+ " Length:"+name.length());
        }
    } 
}

Answer for part 2

import java.util.*; 
import java.io.*; 
  
public class Main { 
    public static void main(String args[]) 
    { 
        Stack<Integer> myScores = new Stack<Integer>(); 
        Scanner sc = new Scanner(System.in);
        System.out.println("\nEnter 5 integers: ");
        for(int i=0;i<5;i++){
            System.out.print("Enter integer:");
            int num = sc.nextInt();
            myScores.push(num); 
        }
        
        System.out.println("\nThe scores are: ");
        int sum = 0;
        while(!myScores.empty()){
            int thisscore = myScores.pop();
            System.out.print(thisscore+"\t");
            sum = sum + thisscore;
        }
        System.out.println("\nSum of all:"+sum);
        System.out.println("Average:"+(sum/5));
    } 
}

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