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You may, if you want, include parameter names in function prototypes. For
example, instead of int rabbits (int); you can write the following:
int rabbits (int n);
Although parameter names are optional, there are two advantages to including them. First, parameter names often provide a form of documentation; second, if you include parameter names in function prototypes, you can write the function prototype by copying from the function definition, without any error-prone removal of the parameter names.