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Normally, a function cannot change a parameter's value
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When your program's pass parameters to functions, C++
places a copy of the parameter's value in a temporary storage called
the stack;
any changes the function makes to the parameter effect only the copy
of the value
that resides on the stack
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To change a parameter's value, a function must have knowledge of the
variable's
address
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Using C++ address operator (&), your programs can pass
a variable's address to a function
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When a function receives a variable's address, the function must
declare the parameter variables as pointers (by preceding the
variable names
with a *)
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When the function wants to use the value pointed to by the pointer,
the function must precede the pointer variable's name with a *
