I know alot of similar questions were asked before but i couldn't find something that would fix this warning i get:
MyIntFunctions.c:19:2: warning: implicit declaration of function ‘printf’ [-Wimplicit-function-declaration]Occurs here:
void IntPrint (const void *key)
{ printf("%d", *(int*)key); // line 19 printf("\t-->\t");
}and a similar warning:
MyStringFunctions.c:22:2: warning: implicit declaration of function ‘printf’ [-Wimplicit-function-declaration]
void StringPrint (const void *key)
{ printf("%s",(char*)key); //line 22 printf("\t-->\t");
}I really want to understand what is wrong so i won't do that again in the future.
24 Answers
You need to include the appropriate header
#include <stdio.h>If you're not sure which header a standard function is defined in, the function's man page will state this.
You need to include a declaration of the printf() function.
#include <stdio.h>the warning or error of kind IMPLICIT DECLARATION is that the compiler is expecting a Function Declaration/Prototype..
It might either be a header file or your own function Declaration..
warning: incompatible implicit declaration of built-in function 'printf'
warning: incompatible implicit declaration of built-in function 'scanf'
the above warnings of compiler says that there is need to include declaration of printf and scanf i.e. include appropriate header
#include <stdio.h>
