Null statement:
The “null or empty statement” is a statement containing only a semi colon. It takes the following form:
// it is a null statement.
Null statement are commonly used as place holders in iteration statements or as statements on which to place labels at the end of compound statements or functions.
Compound statement:
C++ allows a group of statements enclosed by pair of braces { }. This group of statements is
called as a compound statement or a block. The general format of compound statement is:
