body, html { width: 100%; height: 100%; } body{ padding-top:100px; } body, h1, h2, h3, h4, h5, h6 { font-family: "Lato","Helvetica Neue",Helvetica,Arial,sans-serif; font-weight: 700; } #content{ min-height: 600px; } #banner_image { padding-bottom: 50px; text-align: center; color: #f8f8f8; background: url(../img/intro-bg_1.jpg) no-repeat center center; background-size: cover; } #banner_content { position: relative; padding-top: 6%; padding-bottom: 6%; margin-top: 12%; margin-bottom: 12%; background-color: rgba(0, 0, 0, 0.7); max-width: 660px; } #item_list { padding-top: 50px; } /*This code ensures that when we navigate to a particular section of a page, the section does not get lost behind the header*/ #cameras:before, #watches:before, #shirts:before{ display: block; content: " "; margin-top: -85px; height: 85px; visibility: hidden; } #login-panel .panel-footer{ font-weight:normal; } footer { padding: 10px 0; background-color: #101010; color:#9d9d9d; bottom: 0; width: 100%; } .red{ color:red; } #settings-container{ margin-bottom:10px; } .navbar-brand{ font-size:20px; } @media(max-width:768px) { #banner_content { padding-bottom: 15%; } footer{ text-align:left; } } .remove_item_link{ color:#0000ff; }

C- Program Structure

Before we study the basic building blocks of the C programming language, let us look at a bare minimum C program structure so that we can take it as a reference in the upcoming chapters.

Hello World Example

A C program basically consists of the following parts −
  • Preprocessor Commands
  • Functions
  • Variables
  • Statements & Expressions
  • Comments
Let us look at a simple code that would print the words "Hello World" −
#include <stdio.h>

int main() {
   /* my first program in C */
   printf("Hello, World! \n");
   return 0;
Let us take a look at the various parts of the above program −
  • The first line of the program #include <stdio.h> is a preprocessor command, which tells a C compiler to include stdio.h file before going to actual compilation.
  • The next line int main() is the main function where the program execution begins.
  • The next line /*...*/ will be ignored by the compiler and it has been put to add additional comments in the program. So such lines are called comments in the program.
  • The next line printf(...) is another function available in C which causes the message "Hello, World!" to be displayed on the screen.
  • The next line return 0; terminates the main() function and returns the value 0.

Compile and Execute C Program

Let us see how to save the source code in a file, and how to compile and run it. Following are the simple steps −
  • Open a text editor and add the above-mentioned code.
  • Save the file as hello.c
  • Open a command prompt and go to the directory where you have saved the file.
  • Type gcc hello.c and press enter to compile your code.
  • If there are no errors in your code, the command prompt will take you to the next line and would generate a.out executable file.
  • Now, type a.out to execute your program.
  • You will see the output "Hello World"printed on the screen.
$ gcc hello.c
$ ./a.out
Hello, World!
Make sure the gcc compiler is in your path and that you are running it in the directory containing the source file hello.c.
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