Q.Give a sample C program that prints the message "Welcome to PUC" (illustrating the basic structure of a C program with a standard library function). The textbook presents this worked program, transcribed exactly as printed (including its printed errors):

#include<stdio.h>  
void main()  
{  
    printf("Welcome to PUC\n");  
}  

Sample output printed in the textbook:

Welcome to PUC  

Every C program is built from a set of standard sections arranged in a fixed order. Knowing this layout lets you read and write programs quickly, and it is a frequently asked exam topic.

The usual sections are:

1. Documentation section - comments giving the program's name and purpose.
2. Link section - #include directives that link the standard library header files.
3. Definition section - #define directives that define symbolic constants and macros.
4. Global declaration section - variables and function declarations available to the whole program.
5. main() function section - the compulsory function where execution begins. It has a declaration part (local variables) and an executable part (the statements), enclosed in braces { }.
6. Sub-program section - the user-defined functions that main() may call. …