common topics between C and C++

Hello guys … welcome back!!!! We looked at introduction of C++ in previous post. Now we are going to read some concepts which are common in both C and C++  because it is important for us to remember these for next level.
So here we go!!!


           In C++ language, some concepts which we studied in C language, like ‘semicolon’, ‘keywords’, ‘identifiers’. Let us revise it.
Individual statement in both language must be ended with a semicolon. For example,
y=x;
x=x+1;

We can also write like
y=x; x=x+1;

Identifiers:

Identifiers is a name used to identify a variable and other user define function items. It starts with A to Z,a to z, 0 to 9 digits, an under score (_). It does not accept either punchuation marks or special characters like @, $ etc.
          Examples are: abc, ABC, a_234.

Keywords:

Keywords are reserved words. These words cannot be used as constant or variable or any identifiers.
Examples: char, far, for, return etc.

TRIGRAPHS:

            Trigraphs is a sequence of three characters which have an alternative representation and represents a single character. These sequence starts with two question marks.
Symbols
Represented in Trigraph as
#
??=
\
??/
^
??’
~
??-
{
??,
}
??>

All the compilers do not support trigraphs.

Whitespace:

            Whitespace means blank lines. It describe blanks, tabs, newline characters and comments. It separates one part from another. It enables the compiler to identify  one element from another in a statement.
Int name;
     
In above example whitespace is the space between datatype and identifier.

A = B;

In above example, there are no whitespace characters necessary between A and =, or = and B. so we are free to include as many white space characters as required.

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