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character set, identifiers, keywords Character set: A character denotes any alphabet, digit or special symbol used to represent information. Valid alphabets, numbers and special symbols allowed in C are The alphabets, numbers and special symbols when properly combined form constants, variables and keywords. Identifiers: Identifiers are user defined word used to name of entities like variables, arrays, functions, structures etc. Rules for naming identifiers are: 1) name should only consists of alphabets (both upper and lower case), digits and underscore (_) sign. 2) first characters should be alphabet or underscore 3) name should not be a keyword 4) since C is a case sensitive, the upper case and lower case considered differently, for example code, Code, CODE etc. are different identifiers. 5) identifiers are generally given in some meaningful name such as value, net_salary, age, data etc. An identifier name may be long, s...
Introduction to C C is a programming language developed at AT & T’s Bell Laboratories of USA in 1972. It was designed and written by a man named Dennis Ritchie. In the late seventies C began to replace the more familiar languages of that time like PL/I, ALGOL, etc ANSI C standard emerged in the early 1980s, this book was split into two titles: The original was still called Programming in C, and the title that covered ANSI C was called Programming in ANSI C. This was done because it took several years for the compiler vendors to release their ANSI C compilers and for them to become ubiquitous. It was initially designed for programming UNIX operating system. Now the software tool as well as the C compiler is written in C. Major parts of popular operating systems like Windows, UNIX, Linux is still written in C. This is because even today when it comes to performance (speed of execution) nothing beats C. Moreover, if one is to extend the operating system to work...
Constants And Variable Constants: Constant is a any value that cannot be changed during program execution. In C, any number, single character, or character string is known as a constant. A constant is an entity that doesn’t change whereas a variable is an entity that may change. For example, the number 50 represents a constant integer value. The character string "Programming in C is fun." is an example of a constant character string. C constants can be divided into two major categories: Primary Constants Secondary Constants These constants are further categorized as Numeric constant Character constant String constant Numeric constant: Numeric constant consists of digits. It required minimum size of 2 bytes and max 4 bytes. It may be positive or negative but by default sign is always positive. No comma or space is allowed within the numeric constant and it must have at least 1 digit. The allowable range for integer const...
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