incompatible implicit declaration of built-in function 'printf'

In C, the error "incompatible implicit declaration of built-in function 'printf'" typically occurs when the printf function is used without including the necessary header file. To resolve this error, you need to include the stdio.h header file at the beginning of your program. This header file contains the declaration of the printf function, allowing the compiler to recognize it.

Here's an example of how to include the stdio.h header file in your C program:

#include <stdio.h>

int main() {
   printf("Hello, World!");
   return 0;
}

By including the stdio.h header file, you ensure that the printf function is properly declared and recognized by the compiler. This should resolve the "incompatible implicit declaration of built-in function 'printf'" error.