World of Computing by Gerard O'Regan

Author:Gerard O'Regan
Language: eng
Format: epub
Publisher: Springer International Publishing, Cham

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Pascal is a block-structured language with programs structured into procedures and function blocks. These can be nested to any depth, and recursion is allowed. Each block has its own constants, types, variables and other procedures and functions, which are defined, within the scope of the block.

Pascal was criticised as being unsuitable for serious programming by Brian Kernighan and others (Kernighan 1981). Many of these deficiencies were addressed in later versions of the language. However, by then Denis Richie at Bell Labs had developed the C programming language , which became popular in the industry. C is a general-purpose and a systems programming language.

It was originally designed as a language to write the kernel for the UNIX operating system, which was novel as operating systems were traditionally written in assembly languages. The success of C in writing the UNIX kernel led to its use on several other operating systems such as Windows and Linux. It also influenced later language development such as C++, and it is one of the most commonly used systems programming languages. The language is described in detail in Kernighan and Ritchie (1978).

It provides high-level and low-level capabilities, and a C program that is written in ANSI C with portability in mind may be compiled for a very wide variety of computer platforms and operating systems with minimal changes to the source code. The C language is now available on a wide range of platforms.

C is a procedural programming language and includes conditional statements such as the “if statement”, the “switch statement”, iterative statements such as the “while” statement or “do” statement and the assignment statement.If Statement

if (A == B)

A = A + 1;

else

A = A – 1;5

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