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If an implicit declaration does not match the built-in definition, you get this warning. To fix the problem, you have to declare the functions before using them; normally you do this by including the appropriate header.
If a name appears in a program and is not explicitly declared, it is implicitly declared. The scope of an implicit declaration is determined as if the name were declared in a DECLARE statement immediately following the PROCEDURE statement of the external procedure in which the name is used.
You need to add #include <stdio.h> to the top of your file.
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