Description |
 |
C expressions can be statements. A null
statement is simply a semicolon by itself.
You can use any valid expression as an expression statement
by terminating it with a semicolon. Expression statements are evaluated
for their side effects; such as assignment or function calls. If
the expression is not specified, but the semicolon is still provided,
the statement is treated as a null statement.
Null statements are useful for specifying no-operation statements.
No-operation statements are often used in looping constructs where
all of the work of the statement is done without an additional statement.
Example |
|
A program fragment that sums up the contents of an array named x containing 10 integers might look like this:
for(i=0,s=0; i<10; s+=x[i++]);
The syntax of the “for ” statement
requires a statement following the closing ) of the for. A null statement (;) satisfies this syntax requirement.
