#include <iostream>
using namespace std;
class Employee{
  int id;
  static int count;
  //if we input count = 1000 it willl throw error
//int count;
  //To preserve the employee detail we will now use the static variable
  //static variable class ke bahar likhana
  
  public:
  void setData(void){
    cout<<"Enter your id: "<<endl;
    cin>>id;
    count ++;
  }
  void getData(void){
    cout<<"the id of emmployee is"<<id << "This is employee number " << count << endl;
    
    
  }
  static void getCount(void){
      cout<<id; //throw an error
    cout<<"The vaue of count is"<<count<<endl;
  }
};

int Employee :: count;  //default value is 0
//if we input count = 1000 it will not show error  it will run as in sequence
// as 10001, 10002 , 10003, 10004 if you write the number out of sequence it will run but will break further
int main()
{
    Employee abhay,nirbhay,vritabhay;
  //abhay nirbhay vritabhay sharing same count variable
  //count is static data member of class employee
    // abhay.id = 9;
    // abhay.count = 54;
    // cannot do this as id and count are private
    abhay.setData();
    abhay.getData();
    Employee :: getCount();
    
    nirbhay.setData();
    nirbhay.getData();
     Employee :: getCount();
     
    vritabhay.setData();
    vritabhay.getData();
     Employee :: getCount();
    
    
    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
}