You tell the compiler the function is valid by a)coding the function before you call it the first time or b)using a function prototype if the code for the function does not appear before the first call. Ive used the extern function declaration before, but in this case I was wondering where utoa was actually defined. ) I know those things happen, but its still embarrassing if others are trying to help you and you supply them with incorrect information. h file.Ä®dit: added #include "delayx.h" to delayx. An implicit declaration means to call a function without previously telling the compiler that this is a valid function. Google 'c extern keyword function declaration' and read all about it. Code: include include include include include![]() and here i have attached the headers for your reference which i used. Implicit declaration If a name appears in a program and is not explicitly declared, it is implicitly declared. Place a declaration of portable_delay_cycles in the. error: implicit declaration of function âinterruptiblesleeponâ -Werrorimplicit-function-declaration line: interruptiblesleepon(
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