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example:

   float   square(float);

It is common practice to place lists of function prototype declarations in header files*.

Note that pre-ANSI C code does not use complete function prototype declarations.  Rather, a function is declared by stating the type of its return value and following the function identifier with empty parentheses to distinguish it as a function rather than a variable:

    float  square();

The default return type for functions is int, and many pre-ANSI programs took advantage of this by not declaring those functions which returned ints at all.

While most ANSI C compilers permit these short cuts, it is considered good practice to provide full prototype declarations for all functions.  In addition to aiding program 

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94

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52189

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File inclusion

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File inclusion - p175