C/C++ Compiler (cl.hlp) (Table of Contents; Topic list)
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C4016
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     Compiler warning (level 3) C4016
 
     'function' : no function return type; using int as default
 
     Since the given function had not yet been declared or defined, the
     return type was unknown. A default return type of int was assumed.
 
     This warning may be avoided by adding a prototype for the given
     function.
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