C programming. Please explain. I rate like.

4 1 // Fig. 2.4: fig02_04.C 2 // Printing multiple lines with a single printf. 3 #include 5 // function main begins program execution 6 int main( void ) 8 printf("Welcome to C! "); 9 } // end function main Welcome to C! Fig. 2.4 | Printing multiple lines with a single printf. Figure 2.4 a. How does the printf on line 8 perfomits role in the program? b. Why are these comments in the program