warning: implicit declaration of function
时间: 2023-11-19 16:36:56 浏览: 31
"Implicit declaration of function" is a type of warning message that occurs during the compilation of a C or C++ program. It indicates that a function has been called in the code but the compiler has not seen its declaration before. This can happen when a function is defined in a separate source file or library that has not been included in the current file, or when the function has not been defined at all.
This warning message is usually not a critical error, but it can cause issues during runtime if the function is not properly defined or declared. To fix this warning, the function should be properly declared before it is called in the code. This can be done by including the header file that defines the function or by adding a prototype declaration at the beginning of the file.