#include<bits/stdc++.h>
#define endl '\n'
#define long long int int
using namespace std;
class Node{
    public:
    int value;
    Node *next;
    Node(int value)
    {
        this->value=value;
        this->next=NULL;
    }
};

void print(Node *head)
{
    cout<<"Values of the node: ";
    Node *temp = head;
    while(temp != NULL)
    {
        cout<<temp->value<<" ";
        temp = temp->next;
    }
}
void insert(Node *&head)
{
    cout<<"Enter the new value: ";
    int value;  cin>>value;
    Node *newNode = new Node(value);

    if(head == NULL)
    {
        head = newNode;
    }
    else{
        Node *temp = head;
        while(temp->next != NULL)   temp = temp->next;
        temp->next=newNode;

        cout<<"New node added. Do you want to print it?\nPress-1 to print"<<endl;
        int opt;    cin>>opt;
        if(opt==1)  print(head);
    }

}

void solve()
{
    Node *head = new Node(1);
    Node *a = new Node(2);
    Node *b = new Node(3);
    Node *c = new Node(4);
    // connections
    head->next=a;
    a->next=b;
    b->next=c;

    cout<<"Choose your option: "<<endl;
    cout<<"1 for print"<<endl;
    cout<<"2 for insert"<<endl;

    int opt;    cin>>opt;


    if(opt==1)  print(head);
    else if(opt==2)     insert(head);
}
int main()
{
    int t;
    // cin >> t;
    t = 1;
    while(t--)
    {
        solve();
    }

    return 0;
}
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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
}