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The solution to the rabbits dilemma is to use a function
prototype. A function prototype is like a function definition
without parameter names or a body. By supplying a function prototype, you
supply only what the C compiler needs to know about a function's
parameter types and return type in order to prepare calls to the function.
In the function prototype of rabbits, for example, the parameter
name and the entire body
disappear, leaving only the data-type declarations for the return value and
the parameter:
int rabbits (int);
Because the body of the function is supplied later, a function prototype cannot refer to other functions, be they defined or not yet defined. Other definitions can refer to the function once its function prototype has been seen, however.