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Chapter 3 – Variables and Arithmetic Operations
Variable Rules
Must declare all variable names – List name and type
Keep length to 31 characters – Older compiler restriction
Give numeric values to variables with assignment statement
variable_name = value; assignment operator
Lesson 3.1
Naming Identifiers
First character must be letter – az, AZ or _
Other characters
– letters (az, AZ, _ ) or digits 09
Cannot use C++ keywords (reserved words) Cannot have blank within identifies
Lesson 3.1
Keywords
Words with special meaning to C++
Also includes alternative representations of certain operators and punctuators
Full listing in Table 3.1 Examples:
– auto, bool, float, inline, union, delete – namespace, private, void
Lesson 3.1
Declaring Variables
Variables MUST be declared List name and data type
Variables of same type may be declared in same statement (separate by comma)
Causes C++ compiler to know size of space to be reserved for storing variable’s value
data type double radius, diameter;variable names separator
Lesson 3.1
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