Chapter 2.1, Problem 7STE

Program Plan Intro

Defining good variable name:

• In every programming, variable names and other names should at least hint at the meaning or use of thing they are naming.
• It is very useful to understand a program if the variables contains the meaningful names.

Rules for naming variable:

• Variable name cannot be a C++ keyboard. Example “int”, “double” cannot be a variable name because of, it is the keyword of C++.
• Variable name must begin with an alphabet that is upper case (“A” to “Z”) or lowercase (“a” to “z”).
• Variable name can contain an underscore (_) but can’t contain the other characters such as “!”, “@”, “&” etc.
• The name of the variable can be of any length however only first 31 characters are important.
• Variable name contains the combination of upper and lowercase letters.

Example:

The example for proper and improper usage of variable names is given below:

Proper usage of variable names: “mark”, “highestRank”, “first_place” etc.

Improper usage of variable names: “12mark”, “!high@3”, “*place*” etc.

Explanation of Solution

Variable to hold the pay rate for an hourly employee:

• The variable name to hold the pay rate for an hourly employee is “payrate”. Based on the description, the given variable needs to be declared in datatype of “double”...

Explanation of Solution

Variable to hold the highest score in an exam:

• The variable name to hold the highest score in an exam is “highestScore”. Based on the description, the given variable needs to be declared in datatype of “double”...