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The following program, which computes the average of three prices, consists
of just one function, the main function:
main ( ) {
(10.2 + 12.0 + 13.2) / 3;
}
This main function consists of the function name,
main, followed by matched parentheses—which you should ignore for
now—followed by a single statement sandwiched between matched braces that
delimit the function's body.
The one and only statement in the body of the main function contains
two instances of the addition operator, +, and one instance of
the division operator, /. Note that this statement, like
most C statements, is terminated by a semicolon.
The semicolon, the parentheses, and the braces act as punctuation. Occasionally, such symbols, in such contexts, are called punctuators.
Note also that the sample program is quite catatonic: It accepts no input data and produces no output result.