#include<iostream>

#define SIZE 5
 
using namespace std;
 
class STACK
{
    private:
        int num[SIZE];
        int top;
    public:
        STACK();    //defualt constructor
        int push(int);
        int pop();
        int isEmpty();
        int isFull();
        void displayItems();
};
STACK::STACK(){
    top=-1;
}
 
int STACK::isEmpty(){
    if(top==-1)
        return 1;
    else
        return 0;   
}
 
int STACK::isFull(){
    if(top==(SIZE-1))
        return 1;
    else
        return 0;
}
 
int STACK::push(int n){
    //check stack is full or not
    if(isFull()){
        return 0;
    }
    ++top;
    num[top]=n;
    return n;
}
 
int STACK::pop(){
    //to store and print which number
    //is deleted
    int temp;
    //check for empty
    if(isEmpty())
        return 0;
    temp=num[top];
    --top;
    return temp;
     
}
 
void STACK::displayItems(){
    int i; //for loop
    cout<<"STACK is: ";
    for(i=(top); i>=0; i--)
        cout<<num[i]<<" ";
    cout<<endl;
}
 
int main(){
    //declare object
    STACK stk;
    int choice, n,temp;
     
    do
    {
        cout<<endl;
        cout<<"0 - Exit."<<endl;
        cout<<"1 - Push Item."<<endl;
        cout<<"2 - Pop Item."<<endl;
        cout<<"3 - Display Items (Print STACK)."<<endl;
         
        cout<<"Enter your choice: ";
        cin>>choice;
         
        switch(choice){
            case 0: break;
             
            case 1:
                cout<<"Enter item to insert: ";
                cin>>n;
                temp=stk.push(n);
                if(temp==0)
                    cout<<"STACK is FULL."<<endl;
                else
                    cout<<temp<<" inserted."<<endl;
            break;
                 
            case 2:
                temp=stk.pop();
                if(temp==0)
                    cout<<"STACK IS EMPTY."<<endl;
                else
                    cout<<temp<<" is removed (popped)."<<endl;
            break;
             
            case 3:
                stk.displayItems();
                break;
             
            default:
                cout<<"An Invalid choice."<<endl;
        }   
    }while(choice!=0);
 
     
    return 0;
     
}
by

C++ Online Compiler

Write, Run & Share C++ code online using OneCompiler's C++ online compiler for free. It's one of the robust, feature-rich online compilers for C++ language, running on the latest version 17. Getting started with the OneCompiler's C++ compiler is simple and pretty fast. The editor shows sample boilerplate code when you choose language as C++ and start coding!

Read inputs from stdin

OneCompiler's C++ online compiler supports stdin and users can give inputs to programs using the STDIN textbox under the I/O tab. Following is a sample program which takes name as input and print your name with hello.

#include <iostream>
#include <string>
using namespace std;

int main() 
{
    string name;
    cout << "Enter name:";
    getline (cin, name);
    cout << "Hello " << name;
    return 0;
}

About C++

C++ is a widely used middle-level programming language.

  • Supports different platforms like Windows, various Linux flavours, MacOS etc
  • C++ supports OOPS concepts like Inheritance, Polymorphism, Encapsulation and Abstraction.
  • Case-sensitive
  • C++ is a compiler based language
  • C++ supports structured programming language
  • C++ provides alot of inbuilt functions and also supports dynamic memory allocation.
  • Like C, C++ also allows you to play with memory using Pointers.

Syntax help

Loops

1. If-Else:

When ever you want to perform a set of operations based on a condition If-Else is used.

if(conditional-expression) {
   //code
}
else {
   //code
}

You can also use if-else for nested Ifs and If-Else-If ladder when multiple conditions are to be performed on a single variable.

2. Switch:

Switch is an alternative to If-Else-If ladder.

switch(conditional-expression){    
case value1:    
 // code    
 break;  // optional  
case value2:    
 // code    
 break;  // optional  
......    
    
default:     
 code to be executed when all the above cases are not matched;    
}

3. For:

For loop is used to iterate a set of statements based on a condition.

for(Initialization; Condition; Increment/decrement){  
  //code  
}

4. While:

While is also used to iterate a set of statements based on a condition. Usually while is preferred when number of iterations are not known in advance.

while (condition) {  
// code 
}

5. Do-While:

Do-while is also used to iterate a set of statements based on a condition. It is mostly used when you need to execute the statements atleast once.

do {  
 // code 
} while (condition);

Functions

Function is a sub-routine which contains set of statements. Usually functions are written when multiple calls are required to same set of statements which increases re-usuability and modularity. Function gets run only when it is called.

How to declare a Function:

return_type function_name(parameters);

How to call a Function:

function_name (parameters)

How to define a Function:

return_type function_name(parameters) {  
 // code
}