Warning: implicitly declaring library function 'printf' with type 'int (const char *,...)‘

solve the problem

warning: implicitly declaring library function 'printf' with type'int (const char *, ...)' [-Wimplicit-function-declaration]

Solutions

because printf This kind of library function is too common , So when the compiler compiles , Found no declaration in source file printf This function uses it directly , Then the compiler will be printf Function implicitly generates a declaration . Now the compiler prompts that it is printf The generated implicit declaration is ：int printf(const char *, ...).

Solution

To eliminate this hint , Just add printf Just your statement .printf Function is a library function , Its statement is in stdio.h In the document . therefore , Just add #include <stdio.h> That's all right. .