initialize strings in C++

Various methods to initialize strings in C++ 

#include <iostream>
#include <string>

using namespace std;

int main()
{
     string s0("welcome to programsplusplus");
     string s1(s0);
     std::cout<<s1;

     string s2(s0,8,3);
     std::cout<<"\n"<<s2;

     string s4("hello world",4);
     std::cout<<"\n"<<s4;

     string s5(10,'x');
     std::cout<<"\n"<<s5;

     string s6(10,42);
     std::cout<<"\n"<<s6;

     string s7(s0.begin(),s0.begin()+5);
     std::cout<<"\n"<<s7;

     return 0;
}

------ OUTPUT------

Please do comment if you don't understand any part or want to know more or just want to say thanks. I love programming and love to teach my friends. Your suggestions and appreciation will make this blog much better.

use of string iterator

// Program to demonstrate the use of string iterator
#include <iostream>
#include <string>

int main()
{
     using namespace std;
     int counter=0;
     string str("welcome to programsplusplus");
     // declares the string iterator
     string::iterator it;
     for (it=str.begin(); it<str.end(); it++)
     {
          // displays each character that the iterator points to
          counter++;
          cout<<" "<<*it;
     }
     cout<<"\n"<<"Total length of the string : "<<counter;

     return 0;
} // end of main

------OUTPUT------

Please do comment if you don't understand any part or want to know more or just want to say thanks. I love programming and love to teach my friends. Your suggestions and appreciation will make this blog much better.

C++ program to demonstrate the concept of Object Oriented Programming Structure(OOPS)

// C++ program to demonstrate the concept of Object Oriented Programming Structure(OOPS)

#include<iostream>

using namespace std;

class MarkSheet
{
     int marks;

     public :

     void setMarks(int marks) // setter function
     {
          this->marks = marks;
     }

     int getMarks() // getter function
     {
          return this->marks;
     }

}; // end of class MarkSheet

int main()
{
     MarkSheet objA; // object A of class MarkSheet
     MarkSheet objB; // object B of class MarkSheet
     int temp;

     // propmts the user to enter the marks of student A
     cout<<" Enter the marks of student A : ";
     cin>>temp;
     objA.setMarks(temp); // uses the setter function to set the marks of student A

     // propmts user to enter the marks of student B
     cout<<" Enter the marks of student B : ";
     cin>>temp;
     objB.setMarks(temp); // uses the setter function to set the marks of student B

     cout<<"\n ---------- Marks of A and B are as follows ------------ \n";
     cout<<" Marks of student A : "<<objA.getMarks(); // displays the marks of student A
     cout<<"\n Marks of student B : "<<objB.getMarks(); // displays the marks of student B
     return 0;
}// end of main

Please do comment if you don't understand any part or want to know more or just want to say thanks. I love programming and love to teach my friends. Your suggestions and appreciation will make this blog much better.

------ OUTPUT ----- 

Basic OOP Program

 Object Oriented Programming or OOP is an approach to programming(in general) that is based on the view of treating each entity or element as an object, in such a way that each object is unaware of the existence of other objects. Before going further, let me lay out some basic details for you.

CLASS -  Many of you must have the definition of class as : "a class is the collection of data members of same or different type, grouped under a common name". Well this is actually a very trivial definition of class. A class serves as a blueprint for building something. Simply put, it is a layout that describes where everything should be put together. In programming

terminology, a class is a way of binding the data describing an entity and its associated functions together.

Now i can go on and on, about classes and object, why the use of classes, data abstraction and so on, but all that you can find in any textbook. Let us jump to the practical implementation of OOP.

The article follows a program that demonstrates the use of classes and objects. Before i get into the nitty gritty of it all, please understand that you need to focus on the concept , not the

technical details. The "TECH DETAILS" will come with time and practice. Focus must be on understanding the concept. So let's begin :

The following program creates a class "MarkSheet" with a single member variable "marks" of type int(a.k.a integer). Now the class also has two PUBLIC member functions, a setter function and a correspondinggetter function. Getter and Setter functions are not some SPECIAL functions, they are just named that way, sort of a trend. The job of a "getter" function is to return

the value of a variable of the class and the job of a "setter" function is to SET the value of a variable of the class.

For e.g : here is a demo setter function

void setDAY(int x) // sets the value of 'day' with the value contained by 'x'

{

     day = x;

}

Similarly, e.g : here is a demo getter function

int getDay() // 'gets' or returns the value of the variable 'day'

{

     return day;

}

The class has the following setter and getter functions :

1 - setMarks() // sets the marks of the student

2 - getMarks() // gets or returns the marks of the student

In the main() function, two objects,name objA and objB are declared that represent object of student A and B respectively. The program then prompts the user to enter the values

of the marks of students A and B. The marks are set by using the setMarks() setter function. After that, the marks are displayed by calling the getMarks() getter function.