Statements

Statements

A computer program is a set of statements or instructions to perform a specific task. These statements are intended to perform specific action. The action may be of variable declarations, expression evaluations, assignment operations, decision making, looping and so on.

There are two kinds of statements used in C++.

(i) Null statement

(ii) Compound statement

(i) Null statement

The "null or empty statement" is a statement containing only a semicolon. It takes the flowing form:

; // it is a null statement

Null statements are commonly used as placeholders in iteration statements or as statements on which to place labels at the end of compound statements or functions.

(ii) Compound (Block) 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:

{

statement1;

statement2;

statement3;

}

For example

{

int x, y;

x = 10;

y = x + 10;

}

The compound statement or block is a treated as a single unit and may be appear anywhere in the program.