Lesson 2-New line and variables:- coding overdose

01->New line


To insert a new line in the program , you need to end the current line using \n manipulator.

e.g

#include <iostream>
using namespace std;
 int main()

    {
    cout << "hello world" \n;
    cout << "C++ is very easy";
    return 0;
    }

---

02->Blank line

To insert a new line in the program , you need to end the current line using \n\n manipulator.

#include <iostream>
using namespace std;

 int main()

    {
    cout << "hello world" \n\n;
    cout << "C++ is very easy";

    return 0;
    }

Output:-

---

03->Multiple blank lines

#include <iostream>
using namespace std;

 int main()

    {
    cout << "hello \n world \n ";
    cout << "C++ \n programming \n  is very\n  easy";

    return 0;

    }

Output:-

---

04-Variables

Variable are used in C++, where we need storage for any value, which will change in program. Variable can be declared in multiple ways....

EXAMPLE 1-printing a variable


#include <iostream>
using namespace std;

 int main ()

 {
 int x = 23;

    cout << "hello world \n";
    cout << "my name is jatinder\n";
    cout << "i am \n";
    cout<< x;
    cout<< "year old";

    return 0;

    }

Output:-

Note:-The integer can be declared in either way and you will get the same result..

int x = 23;
or
int x;
x=23;

also in the code, The varialbes shall never be written in quotation marks,, becase if you will type

 cout << "x" ;

then it will type the letter x, and not the variable x

---

EXAMPLE 2- Adding two variables

#include <iostream>
 using namespace std;
 int main ()

 {
 int a=50;
int b=25;

 int result = a+b;

      cout << result;

     return 0;
 }














in above example we predefined the value of the variable..but if we want user to select a value for that variable, we use cin with an extraction operator( >>)


note that cout is written with insersion operator (<<)



Example 3- Doubling a number given by user



#include <iostream>
 using namespace std;
 int main () 

 {
 int a; 
 cout<< "please enter a numbers to be doubled \n ";

        cin>> a;
        cout<< a*2; 

        return 0; 
 }










Example 4- accepting multiple inputs from user

#include
using namespace std;
int main ()


{

int a,b,c;

cout<<"please enter a number"<
cin>>a;
cout<<"please enter another number"<
cin>>b;

c=a+b;

cout<<"the sum of two numbers is"<


return 0;


}

In the next post, you will learn about conditional statements..
Conditional statements