day 38 (#245)

Author: Spreeha

day38/Java/Stack.java

@@ -0,0 +1,96 @@
+/*
+ * To change this license header, choose License Headers in Project Properties.
+ * To change this template file, choose Tools | Templates
+ * and open the template in the editor.
+ */
+package javaapplication3;
+
+/**
+ * @date 11/02/19
+ * @author SPREEHA DUTTA
+ */
+import java.util.*;
+public class Stack {
+    static int st[]=new int[5];
+    static int top=0;
+    public static void push(int n)
+    {
+        if(top<5)
+        {
+            st[top]=n;
+            top++;
+        }
+        else
+            isFull();
+    }
+    public static void pop()
+    {
+        if(top<=5 && top>0)
+        {
+            top--;
+            System.out.println("Popped element is "+st[top]);
+        }
+        else
+            isEmpty();
+    }
+    public static void isEmpty()
+    {
+        if(top<=0)
+            System.out.println("Stack is empty");
+    }
+    public static void isFull()
+    {
+        if(top>=5)
+            System.out.println("Stack is full");
+    }
+    public static void peek()
+    {
+        if(top-1>=0 && top-1<5)
+            System.out.println("The topmost element of the stack is "+st[top-1]);
+        else
+          System.out.println("Stack is empty");  
+    }
+    public static void display()
+    {
+        System.out.println("All the elements present in the stack are:");
+        for(int i=0;i<top;i++)
+            System.out.print(st[i]+" ");
+        System.out.println();
+    }
+    public static void main(String []args)
+    {
+        Scanner sc=new Scanner(System.in);
+        int ch;int c=0;
+        do
+        {
+            c=0;
+            System.out.println("Enter choice ");
+            System.out.println("1. Add new element"
+                    + "\n"+"2. Remove topmost eleemnt"
+            +"\n3. To view the topmost element"+"\n4. To view all the elements");
+            ch=sc.nextInt();
+            switch(ch)
+            {
+                case 1:
+                    System.out.println("Enter element to be added to stack ");
+                    int n=sc.nextInt();
+                    push(n);
+                    break;
+                case 2:
+                    pop();
+                    break;
+                case 3:
+                    peek();
+                    break;
+                case 4:
+                    display();
+                    break;
+                default:
+                    System.out.println("Invalid choice :");
+            }
+            System.out.println("Enter 1 if you wish to continue");
+            c=sc.nextInt();
+        }
+        while(c==1);
+    }
+}

day38/README.md

@@ -182,4 +182,100 @@ stk.push (1);
 stk.push (2);
 stk.pop ();
 stk.peek ();
+```
+
+## Java Implementation
+
+### [Solution](./Java/Stack.java)
+
+```java
+/**
+ * @date 11/02/19
+ * @author SPREEHA DUTTA
+ */
+import java.util.*;
+public class Stack {
+    static int st[]=new int[5];
+    static int top=0;
+    public static void push(int n)
+    {
+        if(top<5)
+        {
+            st[top]=n;
+            top++;
+        }
+        else
+            isFull();
+    }
+    public static void pop()
+    {
+        if(top<=5 && top>0)
+        {
+            top--;
+            System.out.println("Popped element is "+st[top]);
+        }
+        else
+            isEmpty();
+    }
+    public static void isEmpty()
+    {
+        if(top<=0)
+            System.out.println("Stack is empty");
+    }
+    public static void isFull()
+    {
+        if(top>=5)
+            System.out.println("Stack is full");
+    }
+    public static void peek()
+    {
+        if(top-1>=0 && top-1<5)
+            System.out.println("The topmost element of the stack is "+st[top-1]);
+        else
+          System.out.println("Stack is empty");  
+    }
+    public static void display()
+    {
+        System.out.println("All the elements present in the stack are:");
+        for(int i=0;i<top;i++)
+            System.out.print(st[i]+" ");
+        System.out.println();
+    }
+    public static void main(String []args)
+    {
+        Scanner sc=new Scanner(System.in);
+        int ch;int c=0;
+        do
+        {
+            c=0;
+            System.out.println("Enter choice ");
+            System.out.println("1. Add new element"
+                    + "\n"+"2. Remove topmost eleemnt"
+            +"\n3. To view the topmost element"+"\n4. To view all the elements");
+            ch=sc.nextInt();
+            switch(ch)
+            {
+                case 1:
+                    System.out.println("Enter element to be added to stack ");
+                    int n=sc.nextInt();
+                    push(n);
+                    break;
+                case 2:
+                    pop();
+                    break;
+                case 3:
+                    peek();
+                    break;
+                case 4:
+                    display();
+                    break;
+                default:
+                    System.out.println("Invalid choice :");
+            }
+            System.out.println("Enter 1 if you wish to continue");
+            c=sc.nextInt();
+        }
+        while(c==1);
+    }
+}
 ```