Programming in C

454 Appendix A C Language Summary

omitted Outside Anywhere within Constant This

any BLOCK the file or by expressions declaration

other files that only can appear in

contain only one

appropriate place;

declarations variable is

initialized at

the start of

program

execution;

default value

is 0

Inside a BLOCK (See auto) (See auto) defaults to

auto

7.0 Functions

This section summarizes the syntax and operation of functions.

7.1 Function Definition

The general format for declaring a function definition is as follows:

returnType name( type1 param1, type2 param2,... )

{

variableDeclarations

programStatement

programStatement

...

return expression;

}

The function called nameis defined, which returns a value of type returnTypeand has

formal parameters param1,param2,....param1is declared to be of type type1,

param2is declared to be of type type2, and so on.

Local variables are typically declared at the beginning of the function, but that’s not

required.They can be declared anywhere, in which case their access is limited to state-

ments appearing after their declaration in the function.

If the function does not return a value,returnTypeis specified as void.

If just voidis specified inside the parentheses, the function takes no arguments. If ...

is used as the last (or only) parameter in the list, the function takes a variable number of

arguments, as in

Ta ble A.6 Continued

If Storage And Variable Then it can be And can be

Class is is declared referenced initialized with Comments

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