Meanwhile...

    #include<stdio.h>
    
    int main(void) {
        printf "Hello World\n";
        return 0;
    }

    hello.c:4:9: error: expected ';' after expression
      printf "Hello World\n";
            ^
            ;
    hello.c:4:3: warning: expression result unused [-Wunused-value]
      printf "Hello World\n";
      ^~~~~~
    hello.c:4:10: warning: expression result unused [-Wunused-value]
      printf "Hello World\n";
             ^~~~~~~~~~~~~~~
    2 warnings and 1 error generated.