#include <iostream>
#include <vector>
template<typename T>
class Iterator{
  private:
  T* iter;
  public:
  Iterator(T* data):iter(data){}
  T& operator *(){
    return *iter;
  }
  Iterator<T>& operator++(){iter = iter + 1; return *this;}
  Iterator<T> operator++(int){Iterator<T> temp = *this; ++(*this); return temp;}
  bool operator==(const Iterator<T>& right ) const {return (*(this->iter)==*(right.iter));}
  bool operator!=(const Iterator<T>& right) const {return !(*this==right);}
};

class Employers{
  private:
  std::vector<std::string> names;
  
  public:
  Employers() = default;
  void addEmployee(const std::string name){
  if(names.size()==0){
    names.push_back(name);
    names.push_back("null");
  }
  else{
    names.pop_back();
    names.push_back(name);
     names.push_back("null");
   }
  }
  Iterator<std::string> begin(){return Iterator<std::string>(&names[0]);}
  Iterator<std::string> end(){return Iterator<std::string>(&names[names.size()-1]);}
};



int main() 
{ 
  Employers work;
  work.addEmployee("Sina"); work.addEmployee("Paula"); work.addEmployee("steve");work.addEmployee("Sean");
 for(auto i : work){
   std::cout<<i<<"\t";
 }
  
    return 0;
}
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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
}