Introduction.

#include<iostream.h>

iostream.h is a header file which is used at the starting of of c++, It is used to include and use "iostream" header file in that particular program.

in "turbo c++" #Include<iostream.h> is used and in "dev c++" #include<iostream> is used.

Using namespace std;

The built in C++ library routines are kept in the standard namespace. That includes stuff like cout, cin, string, vector, map, etc. Because these tools are used so commonly, it's popular to add "using namespace std" at the top of your source code so that you won't have to type the std:: prefix constantly.

Using namespace std;

The built in C++ library routines are kept in the standard namespace. That includes stuff like cout, cin, string, vector, map, etc. Because these tools are used so commonly, it's popular to add "using namespace std" at the top of your source code so that you won't have to type the std:: prefix constantly.

semicolon (;)

semicolon in c++ is used to end a line.

Curly Brackets - {}

Curly brackets are used at the beginning and at the end of c++ program.

Data Types

1. integers (int) - integers include all natural numbers, to include any type of natural number "int" is used to enter the value.

2. characters (char) - character is used to include any type of character in c++ program. "char" is used for characters.

3. float (float) - float include all decimal numbers, "float" is used to use float data type.

Operators

1. Airthmetic operator include

( + , - , / , * , ++ , -- , % )

2. Relational operators include

( == , != , < , > , < , >= , <= )

3. Logical operators include

( && , || , ! )