History of the 'C' Programming Language

The History of ‘C’.

The ‘C’ Language was developed by Dennis Ritchie at AT&T Bell Laboratories, USA in year 1972.

The ‘C’ language was originally designed for and implemented on the UNIX Operating System. All Essential UNIX applications are written in C.

The Language was known to be BCPL and B’s killer, since It almost overtook their legacy and started its own.

Since ‘B’ and ‘BCPL’ were type-less languages, C became first language to provide variety of data-types.

In 1978 “The C Programming Language”, book written by Kernighan & Dennis caused Revolution in the world of Computer Science.

In 1983, ANSI (American National Standards Institute), established a committee for providing a comprehensive and modern definition of C.

Thus ‘ANSI C’ was completely developed in 1989. Thus ANSI C is also known as C89.

(ISO) International Organization of Standardization had also contributed to standardize C.

PREDECESSORS AND SUCCESSORS OF C

ALGOL (Algorithmic Language)

Developed in mid-1950s

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BCPL (Basic Combined Programming Language)

Developed in 1960s

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B (Advanced Version of BCPL)

Developed by Dennis Ritchie and Ken Thompson in 1969

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C (Successor of B)

Developed By Dennis Ritchie in 1972

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ANSI C and ISO C (Standardized and Advanced C).

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Keywords and Comments in C

KEYWORDS IN C For better blogs do comment your opinion and share the blog What are Keywords? Keywords are the words that convey a special meaning to the compiler. This means the meaning of every particular keyword is already defined to the compiler of the Language. There are total 32 Keywords in C Language and all have their meaning fixed to the compiler. These are the keywords in C. auto double int struct break else long switch case enum register typedef char extern return union const float short unsigned continue for signed void default goto sizeof volatile do if static while The Keywords in Red are the data types they are used to define the data type of a variable. Example: int i; float f; char ch; long l; The Usage of these keywords will be covered as they arrive ...

Data Types In C: Size, Range and Usage.

DATA TYPES IN ‘c’ Data types are keywords which specify the type of data which is used in the programs of C language. Different data types have different storage capacities and different range of data. There are mainly two main categories of data types. PRE-DEFINED DATA TYPES/PRIMARY DATA TYPES INTEGER TYPE DATA TYPES Integer type data type is used to store a whole number or integer number Type Size(bytes) Range int or signed int 2 -32,768 to 32767 unsigned int 2 0 to 65535 short int or signed short int 1 -128 to 127 unsigned short int 1 0 to 255 long int or signed long int 4 -2,147,483,648 to 2,147,483,647 unsigned long int 4 0 to 4,294,967,295 FLOAT TYPE DATA TYPE Float type data types are used to store a real number. Type Size(bytes) Range Float 4 3.4E-38 to 3.4E+38 double 8 1.7E-308 to 1.7E+308 long double 10 3.4E-4932 to 1.1E+4932 CHARACTER DATA TYPE Character type data type is used to store Character type value ...

Variable: Declaration, initialization and Usage

Variable Variables are the names given to some memory location where a value is stored; the variable is corresponding to the data or value input in it. RULES FOR DEFINING A VARIABLE / VARIABLE NAME: · A Variable name should not have name of any KEYWORDS in C. · A Variable name can be alphanumeric but should start with an Alphabet. · A Variable name should not consist of any special symbol other than “_” Underscore Symbol. · A Variable should be defined before using it. VARIABLE DECLARATION: In this step, the variables are declared, this steps always occurs before using the variables. FORMAT: EXAMPLE: VARIABLE INITIALIZATION: Providing a Value to any variable is called initialization. INITIALIZATION AT THE TIME OF DECLARATION: The variable can be given its value at the time of declaration. USAGE OF VARIABLE: Here is the example, to show how a vari...

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