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There are two ways of declaring and defining
procedures in C, the old way and the ANSI standard way
- you may run into both, but use only ANSI form
All procedures in C are really functions, that is they
return a value. The special type voidindicates that a
return value is not used (not wanted). Such void
functions are called procedures.
C has both function declarationsandfunction definitions
- these are two different concepts
A function declarationcontains all the information
required to call the function, that is the name the types
of the parameters and the type of the return value.
These declarations are also called prototypes.
A function definitionincludes all the information in a
function declaration, plus local variables and the
statements in the function - It not only describes how
the function can be called, but also how it computes its
value
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