Chapter 3.4, Problem 3.18CP

Explanation of Solution

Difference between pass by value and pass by reference:

Pass by value	Pass by reference:
A copy of the argument’s value which is passed into the parameter variable is referred as pass by value.	Pass by reference allows the argument to passed into a special type of parameter called reference variable.
In the pass by value, the called module creates new variables to store the value of the arguments passed to it.	The reference variables permit the module to access the original argument of the parameter.
The changes made in the formal parameters do not reflect on the actual parameters...