#include <iostream>
#include <iomanip>
using namespace std;
/* a class named Employee */
class Employee{
  private :
    int empID; /* Employee ID. */
    string empName; /* Employee Name */
    string dept; /* Department */
    float sal; /* Employee Salary */
  public:
    static int emp_num; /* Static data member that hold value of total no. of employees */
    Employee(){ /*Default constructor for Employee class*/
      empID = 0;
      empName = "";
      dept = "";
      sal = 0.0;
      emp_num++;
    } 
    Employee(int id, string name, string d, double s){ /*Parametrized constructor for Employee class*/
      empID = id;
      empName = name;
      dept = d;
      sal = s;
      emp_num++;
    }
    Employee(Employee &e){ /*Copy constructor */
      empID = e.empID;
      empName = e.empName;
      dept = e.dept;
      sal = e.sal;
      emp_num++;
    }
    /*Setter functions*/
    void setID(int id) { empID = id; }
    void setName(string n) { empName = n; }
    void setDept(string d) { dept = d; }
    void setSal(float s) { sal = s; }
    /*Getter functions*/
    int getID() { return empID; }
    string getName() { return empName; }
    string getDept() { return dept; }
    float getSal() { return sal; }
    /* function to calculate the net pay of an employee based on his salary*/
    float calcNetPay(){
      float net_pay;
      if(sal<=10000)
        net_pay=sal;
      else if(sal>10000 && sal<=20000)
        net_pay=sal-sal*0.05;
      else if(sal>20000 && sal<=30000)
        net_pay=sal-sal*0.07;
      else
        net_pay=sal-sal*0.1;
      return net_pay;
    }
    /*function to display the values of all data members of class*/
    void display(){
      cout<<empID<<"\t"<<empName<<"\t"<<dept<<"\t"<<calcNetPay()<<endl;
    }
    ~Employee(){ /*Destructor of Employee class*/  }
};
int Employee::emp_num = 0;
int main() 
{
  Employee emp[5]; /*create an array of 5 objects of class Employee*/
  emp[0]=Employee (5, "Ahmad", "Accounts", 20000 );
  emp[1]=emp[0];
  emp[2]=Employee (10, "Ayesha", "Accounts", 25000);
  emp[3]=Employee (3, "Hassan", "Administration", 10000);
  emp[4]=Employee (6,  "Arsalan", "Administration", 35000);
  
  cout<<"ID"<<"\t"<<"Name"<<"\t"<<"Department"<<"\t"<<"NetPay"<<endl;
  for(int i=0;i<5;i++){ /*loop to call calcNetPay() and display() functions for each object*/
    emp[i].calcNetPay();
    emp[i].display();
  }
  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
}