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C Language standards

C came into existence in between 1969-1973 in parallel with the development of UNIX operating system. The C Programming Language, in the middle of 1980s,was officially standardized by the ANSI X3J11 committee. Until the early 1980s, the language was almost exclusively associated with UNIX. Now, its use has spread much more widely, and today it is among the languages most commonly used in the industry.

BCPL the origination for C language was designed by Martin Richard in the mid-1960s and used during the early 1970s for several projects including OS6 operating system at OXford. The original BCPL compiler was transported both to Multics and to the GE-635 GECOS system by Rudd Canaday and others at Bell Labs. It was the language of choice among the group of people who involved with UNIX.

BCPL, B, and C all fit firmly in the traditional procedural family characterized by Fortan and Algo60. They are particularly oriented towards system programming. They are close to the machine. BCPL, B and C differ syntactically in many details, but broadly they are similar. Programs consist of a sequence of global declarations and function declarations. Several syntactic and lexical mechanism of BCPL are more elegent and regular than those of B and C. In spite of the differences , most of the statements and operators of BCPL map directly into corresponding B and C.

During the 1980s the use of the C language spread widely, and compiler became available on nearly every machine architecture and operating system; in particular it became popular as a programming tool for personal computers, both for manufactures of commercial software for these machine, and for end-users interested in programming.


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difference between structure and union in C Language

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Difference between Linear search and Binary Search in c language

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Binary Search Linear Search Works only on sorted items. such as  1,2,3,4,5,6  etc
Works on sorted as well as unsorted items. 12,4,5,3,2,1 etc Very efficient if the items are sorted Very efficient if the items are less and present in the beginning of the list. such as Suppose your list items are : 12,3,4,5,1 and you want to search 12 number then you get beginning in the list. Works well with arrays and not on linked lists. Works with arrays and linked lists.
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Memory representation of Linked List Data Structures in C Language

Memory representation of Linked List

             In memory the linked list is stored in scattered cells (locations).The memory for each node is allocated dynamically means as and when required. So the Linked List can increase as per the user wish and the size is not fixed, it can vary.

               Suppose first node of linked list is allocated with an address 1008. Its graphical representation looks like the figure shown below:

      Suppose next node is allocated at an address 506, so the list becomes,

  Suppose next node is allocated with an address with an address 10,s the list become,

The other way to represent the linked list is as shown below:

 In the above representation the data stored in the linked list is “INDIA”, the information part of each node contains one character. The external pointer root points to first node’s address 1005. The link part of the node containing information I contains 1007, the address of next node. The last node …