Sections of the C Program

1. Documentation

   • Program Description as Comment

     • // Single-Line Comment
       /* Multi
       Line
       Comment*/

2. Preprocessor/Link Section

   • Include the Library/Builtin Function Header Files

     • #include<stdio.h>

   • Include the User-Defined Header Files

     • #include<my_header.h>

   • Conditional Compilation

     • #ifndef
       
       #endif

3. Definition

   • Define Macro Preprocessor

     • #define num 10

4. Global Declaration

   • Global Variables

     • int num = 10;

   • Global Static Variables

     • static int num = 10;

   • Global Constant Variables

     • const int num = 10;

   • User-Defined Function Declaration/Prototype

     • int is_zero(int);

5. Main() Function

   • Main Program

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

6. Sub Programs

   • User-Defined Function Definition

     • int is_zero(int num){
           if(num==0){
               return 1;
           }
           else{
               return 0;
           }
       }