Introduction to Variable Name and Scope
Every language provides of variable naming and its scope in its own format and rules and regulations. As such according to Dijkstra the concept of a variable in a programming can be given as:
Once a person has understand the way in which variables are used in programming he has understood the quintessence of programming.
To understand what Dujkstra said we will concentrate on some issue of a variable name definition a variable name its naming constraints way of using and its scope.
(a) Definition of A variable Name : A name is a string of characters used by program statements to denote the variable (or identifier) to provide such naming to the variable a sequence of lexical rules are applied to name an entity in a program. It is called as the variable naming. The variable names must be specific understand able and meaningful so that they can by easily used in the program.
Example 28. In C variable names may be rate red interest etc.
(b) Variable Naming Constraints : As such every programming language has its own specified rules to provide a name to a variable or identifier.
Example 29. In C there are some rules to be followed to construct variable names .
Since the maximum length of a variable name is 8 characters an enormous number of variable names can be constructed using the above mentioned rules. It is a good practice to exploit this enormous choice in a naming variables by using meaningful variable names.
(c) Declaration : A variable name is usually introduced by a special statement called a declaration of a variable name.
Example 30. Fig 6.18, shows the variable names declaration in C.
(d) Variable Scope : The variable scope extends form the declaration of the variable until some later closing point specified by the language. The scope of a variable is the range of program instructions over which the name is known. Program instructions can manipulate a variable through its name within its scope. We also say that a variable is visible under its name with its scope and invisible outside it. Different programming languages adopt different rules for binding a variable name to its scope.
Example 31. Consider the sample C program illustrate in fig 6.19.
The declaration int x ,y. Make variable named x and y visible throughout the program main the program constrains an internal block which groups a declaration and statements . the declaration int temp appearing in the block makes name temp visible within the inner block , and invisible outside. In the example if the inner block declaration a new local variable named x the outer variable named y would no longer be visible in the inner block .
Latest technology based Software Engineering Online Tutoring Assistance
Tutors, at the www.tutorsglobe.com, take pledge to provide full satisfaction and assurance in Variable Name and Scope homework help via online tutoring. Students are getting 100% satisfaction by online tutors across the globe. Here you can get homework help for Variable Name and Scope, project ideas and tutorials. We provide email based Variable Name and Scope homework help. You can join us to ask queries 24x7 with live, experienced and qualified online tutors specialized in Variable Name and Scope. Through Online Tutoring, you would be able to complete your homework or assignments at your home. Tutors at the TutorsGlobe are committed to provide the best quality online tutoring assistance for Software Engineering homework help and assignment help services. They use their experience, as they have solved thousands of the software engineering assignments, which may help you to solve your complex issues of Variable Name and Scope. TutorsGlobe assure for the best quality compliance to your homework. Compromise with quality is not in our dictionary. If we feel that we are not able to provide the homework help as per the deadline or given instruction by the student, we refund the money of the student without any delay.
tutorsglobe.com freedom of entry and exit of firms assignment help-homework help by online characteristics of monopolistic competition tutors
tutorsglobe.com myxoedema assignment help-homework help by online thyroid gland and thyroxine tutors
entropy and free energy tutorial all along with the key concepts of first law, second law, entropy, computing entropy change, gibbs free energy and gibbs energy in reactions
tutorsglobe.com hepatitis viruses assignment help-homework help by online medical parasitology tutors
tutorsglobe.com importance of money assignment help-homework help by online money tutors
return on ordinary funds of shareholders, return on capital employed, operating profit margin, gross profit margin.
It is essential to understand the variation between the costing methods and techniques. Costing methods are those that assist a firm to calculate the cost of production or services offered by it.
tutorsglobe.com reproduction assignment help-homework help by online human physiology tutors
tutorsglobe.com entrepreneurship assignment help-homework help by online meaning of production tutors
tutorsglobe.com market equilibrium assignment help-homework help by online equilibrium price tutors
Bit operators and Assignment operators-Homework help, Assignment help including the key concepts of Floating Point, Type conversion, goto and labels.
tutorsglobe.com electric kettle assignment help-homework help by online water heaters tutors
Transmission lines tutorial all along with the key concepts of wave equations of voltage and current, characteristic impedance of transmission line, Parallel wire and coaxial cable transmission line
Physical systems executing SHM tutorial all along with the key concepts of Simple Pendulum, Compound Pendulum, Torsional Systems, L-C Circuit, Diatomic Molecule-Two-Body Oscillations
The major aim of the income statement – or profit and loss account, because it is occasionally called – is to measure and report how much profit (wealth) the business has produced over a period.
1960436
Questions Asked
3689
Tutors
1440400
Questions Answered
Start Excelling in your courses, Ask an Expert and get answers for your homework and assignments!!