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Stack Operation

/* File Name : MyStack.java */

import java.util.Scanner;


class Stack
{
int stk[]=new int[10];
int top,a;
Stack()
{
top=-1;
}
void push (int item)
{
if (top==a)
System.out.println("Stack overflow");
else
stk[++top]=item;
}/*end push*/

boolean isempty()
{
if (top<0)
return true;
else
return false;
}/*end isempty*/

int pop()
{
if (isempty())
{
System.out.println("Stack underflow");
return 0;
}
else
return (stk[top--]);
}/*end pop*/

void stacktop()
{
if(isempty())
System.out.println("Stack underflow ");
else
System.out.println("Stack top is "+(stk[top]));
}/*end stacktop*/

void display()
{
System.out.println("Stack-->");
for(int i=top;i>=0;i--)
System.out.println("\t"+stk[i]);
}/*end display*/
}


class MyStack
{
public static void main(String args[])
{
Scanner sc = new Scanner(System.in);
Stack s=new Stack();
int ch,n;
while(true)
{
System.out.println("\n\tSTACK");
System.out.println("1.Initalize");
System.out.println("2.Push");
System.out.println("3.Pop");
System.out.println("4.Display");
System.out.println("5.Exit");
System.out.print("Enter your choice : ");
ch=sc.nextInt();
switch(ch)
{
case 1: System.out.print("Enter The Size Of Stack : ");
BufferedReader br = new BufferedReader(new InputStreamReader(System.in));
n = Integer.praseInt(br.readLine());
st.int(n);

case 2: System.out.print("Enter Number : ");
n=sc.nextInt();
s.push(n);
s.display();
break;
case 3:
System.out.println("Popped element : "+s.pop());
s.display();
break;
case 4: s.display();
break;
case 5: return;
}
}


}
}


/*
        STACK
1.Push
2.Pop
3.Exit
Enter your choice : 1
Enter Number : 23
Stack-->
        23

        STACK
1.Push
2.Pop
3.Exit
Enter your choice : 1
Enter Number : 55
Stack-->
        55
        23

        STACK
1.Push
2.Pop
3.Exit
Enter your choice : 1
Enter Number : 10
Stack-->
        10
        55
        23

        STACK
1.Push
2.Pop
3.Exit
Enter your choice : 2
Popped element : 10
Stack-->
        55
        23

        STACK
1.Push
2.Pop
3.Exit
Enter your choice : 2
Popped element : 55
Stack-->
        23

        STACK
1.Push
2.Pop
3.Exit
Enter your choice : 2
Popped element : 23
Stack-->

        STACK
1.Push
2.Pop
3.Exit
Enter your choice : 3
Press any key to continue . . .*/

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