studies
Computer Science
October 30, 2014
Craig Hyde
Assignment
Imperative Paradigm
The imperative programming paradigm is an abstraction of real computers which in turn are based on the Turing machine and the Von Neumann machine with its registers and store (memory). At the heart of these machines is the concept of a modifiable store. Variables and assignments are the programming language analog of the modifiable store. The store is the object that is manipulated by the program. Imperative programming languages provide a variety of commands to provide structure to code and to manipulate the store. Each imperative programming language defines a particular view of hardware. These views are so distinct that it is common to speak of a Pascal machine, C machine or a Java machine. A compiler implements the virtual machine defined by the programming language in the language supported by the actual hardware and operating system.
In imperative programming, a name may be assigned to a value and later reassigned to another value. The collection of names and the associated values and the location of control in the program constitute the state. The state is a logical model of storage which is an association between memory locations and values. A program in execution generates a sequence of state. The transition from one state to the next is determined by assignment operations and sequencing commands.
Unless carefully written, an imperative program can only be understood in terms of its execution behavior. The reason is that during the execution of the code, any variable may be referenced, control may be transferred to any arbitrary point, and any variable binding may be changed. Thus, the whole program may need to be examined in order to understand even a small portion of code.
Since the syntax of C, C++ and Java are similar, in what follows, comments made about C apply also to C++ and Java.
Object-Oriented Paradigm
Object-oriented programming (OOP) is a programming
October 30, 2014
Craig Hyde
Assignment
Imperative Paradigm
The imperative programming paradigm is an abstraction of real computers which in turn are based on the Turing machine and the Von Neumann machine with its registers and store (memory). At the heart of these machines is the concept of a modifiable store. Variables and assignments are the programming language analog of the modifiable store. The store is the object that is manipulated by the program. Imperative programming languages provide a variety of commands to provide structure to code and to manipulate the store. Each imperative programming language defines a particular view of hardware. These views are so distinct that it is common to speak of a Pascal machine, C machine or a Java machine. A compiler implements the virtual machine defined by the programming language in the language supported by the actual hardware and operating system.
In imperative programming, a name may be assigned to a value and later reassigned to another value. The collection of names and the associated values and the location of control in the program constitute the state. The state is a logical model of storage which is an association between memory locations and values. A program in execution generates a sequence of state. The transition from one state to the next is determined by assignment operations and sequencing commands.
Unless carefully written, an imperative program can only be understood in terms of its execution behavior. The reason is that during the execution of the code, any variable may be referenced, control may be transferred to any arbitrary point, and any variable binding may be changed. Thus, the whole program may need to be examined in order to understand even a small portion of code.
Since the syntax of C, C++ and Java are similar, in what follows, comments made about C apply also to C++ and Java.
Object-Oriented Paradigm
Object-oriented programming (OOP) is a programming