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; }

Overview of C Programming Language

C is a general-purpose, high-level language that was originally developed by Dennis M. Ritchie to develop the UNIX operating system at Bell Labs. C was originally first implemented on the DEC PDP-11 computer in 1972.
In 1978, Brian Kernighan and Dennis Ritchie produced the first publicly available description of C, now known as the K&R standard.
The UNIX operating system, the C compiler, and essentially all UNIX application programs have been written in C. C has now become a widely used professional language for various reasons −
  • Easy to learn
  • Structured language
  • It produces efficient programs
  • It can handle low-level activities
  • It can be compiled on a variety of computer platforms

Facts about C

  • C was invented to write an operating system called UNIX.
  • C is a successor of B language which was introduced around the early 1970s.
  • The language was formalized in 1988 by the American National Standard Institute (ANSI).
  • The UNIX OS was totally written in C.
  • Today C is the most widely used and popular System Programming Language.
  • Most of the state-of-the-art software have been implemented using C.
  • Today's most popular Linux OS and RDBMS MySQL have been written in C.

Why use C?

C was initially used for system development work, particularly the programs that make-up the operating system. C was adopted as a system development language because it produces code that runs nearly as fast as the code written in assembly language. Some examples of the use of C might be −
  • Operating Systems
  • Language Compilers
  • Assemblers
  • Text Editors
  • Print Spoolers
  • Network Drivers
  • Modern Programs
  • Databases
  • Language Interpreters
  • Utilities

C Programs

A C program can vary from 3 lines to millions of lines and it should be written into one or more text files with extension ".c"; for example, hello.c. You can use "vi", "vim" or any other text editor to write your C program into a file.
This tutorial assumes that you know how to edit a text file and how to write source code inside a program file.
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