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-4111 Warning: The function name is declared informally. For stronger

type checking, use a function defined formally.

The compiler detected that function name is an informal function. Possibly the function returned a different number of arguments in different circumstances, or the function has no prototype declaration. Although nothing is wrong with defining a function this way, informal functions are more prone to errors at runtime. It is recommended that you use formal function declarations (along with function prototypes) that are less error-prone and that the compiler checks more rigorously.