Variables
Every variable must be declared before it can be used. The declaration determines the variable’s type, its storage class, and possibly its initial value. The type of a variable determines how much space it occupies in storage and how the bit pattern it stores is interpreted. For example:
float dollars = 2.5F; // a variable of type float
The variable dollars
designates a region in memory
with a size of 4 bytes. The contents of these four bytes are
interpreted as a floating-point number, and initialized with the
value 2.5.
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