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StackPractice.cpp
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StackPractice.cpp
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#include<iostream>
using namespace std;
class stack{
// Declare Variable's here so you can access them all across your class
int* arr;
int top;
int n;
// Make it all public
public:
// Constructor that will instansiate the variable
stack()
{
n=100;
arr = new int[n];
//in array of 100 top is at -1 which means there is nothing in the array
top=-1;
}
// PUSH OPERATION
void push(int x){
// if top == 100-1 then it will say stack is full
if(top==n-1){
cout<<"Your stack is full: "<<endl;
}
//increment the top from "-1" to "0" which is the first index of array -For example purpose Only
top++;
// arr[0]=user_passed_value;
arr[top]=x;
}
void pop(){
// Condition is used to check wheter the stack is empty or not
if(top==-1){
cout<<"Stack is empty so you can't PoP: "<<endl;
}
// Decrement the value from "0" to "-1" -Just for example
top--;
}
int Top(){
if(top==-1){
cout<<"Stack is empty"<<endl;
}
// It will return the value that the top variable is pointing
return arr[top];
}
bool empty(){
//if stack is empty then it will print the following line.
if(top==-1){
cout<<"Stack is empty!!"<<endl;
}
}
};
int main(){
// Created obect of stack class.
stack st;
st.push(1);
st.push(2);
st.push(3);
// Use cout in case if the stack is not empty the variable will not print
cout<<st.Top()<<endl;
st.pop();
st.pop();
st.pop();
cout<<st.Top()<<endl;
st.pop();
cout<<st.empty()<<endl;
return 0;
}