add stack creation

StackByArray.cpp

@@ -0,0 +1,122 @@
+#include<iostream>
+#define MAX 50
+using namespace std;
+
+class Stack
+{
+	int top;
+	public:
+	int a[MAX];
+	Stack()
+	{
+		top=0;
+	}
+	bool push(int x);
+	int pop();
+	bool isEmpty();	
+	int peek();
+	void display();
+};
+
+
+bool Stack::push(int x)
+{
+	if(top>=MAX)
+	{
+		cout<<"\n\nSTACK OVERFLOW!";
+		return 0;
+	}
+	else
+	{
+		a[top++]=x;
+		cout<<"\n\nSuccessfully Pushed : "<<x;
+		return 1;
+	}
+}
+
+int Stack::pop()
+{
+	if(top<=0)
+	{
+		cout<<"\n\nSTACK UNDERFLOW!";
+		return 0;
+	}
+	else
+	{
+		//cout<<"\n\nSuccessfully Pop : "<<a[top-1];
+		int x=a[top-1];
+		--top;
+		return x;
+	}
+}
+
+bool Stack::isEmpty()
+{
+	return(!top);
+}
+
+int Stack::peek()
+{
+	if(top==0)
+	{
+		cout<<"\n\nSTACK IS EMPTY! ";
+		return -1;
+	}
+	else
+	{
+		return(a[top-1]);
+	}
+}
+
+void Stack::display()
+{
+	if(top<=0)
+	{
+		cout<<"\n\nSTACK IS EMPTY! ";
+	}
+	else
+	{
+		cout<<"\n\nCurrent Stack : ";
+		for(int i=0;i<top;++i)
+		cout<<a[i]<<" ";
+	}
+
+}
+
+int main()
+{
+	Stack s;
+	int ch=1;
+	cout<<"1 to push\n\n2 to pop\n\n3 to display\n\n4 to get top element\n\n5 to check if stack empty\n\n";
+	while(choice)
+	{
+		cout<<"\n\nEnter choice: ";
+		cin>>ch;
+	if(ch==1)
+	{
+		int ele;
+		cout<<"\nEnter element to push: ";
+		cin>>ele;
+		s.push(ele);
+	}
+	else if(ch==2)
+	{
+		cout<<"\n";
+		cout<<s.pop()<<" is popped from stack";
+	}
+	else if(ch==3)
+	{
+		s.display();
+	}
+	else if(ch==4)
+	{
+		cout<<"\n";
+		if(s.peek()!=-1)
+		cout<<s.peek()<<" is on top";
+	}
+	else if(ch==5)
+	{
+		s.isEmpty()?cout<<"\nStack is empty!":cout<<"\nStack is not empty!";
+	}
+}
+}