Programming Logic and Design, Introductory 7th Edition by Joyce Farrell

تمرين 1

Explain why each of the following names does or does not seem like a good variable name to you.

a. d

b. dsctamt

c. discountAmount

d. discount Amount

e. discount

f. discountAmountForEachNewCustomer

g. discountYear2013

h. 2013Discountyear

الخطوة 1 من9

Naming variables:

Declaration is a statement which contains the “data type” and “identifier for variable”.

• Data type can hold the value for variable.

• Identifier is a name of the component.

The declaring the variable name must be follows only three rules such as,

• Variable name must be a single word.

o The name contains the letters, digits, hyphens, underscores, or any other characters without any space.

o Example: “a”, “alpha”, and “isAlpha”. But, “is Alpha” is not a valid variable name.

• Variable name must begin with letter.

o It only allows the starting letter of variable name must be letter.

• Variable name must be short, descriptive, and suitable meaning.