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    Analyze Pseudocode

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    The following are a few examples of pseudocode:

    >> Example 1


    read Customer_Order_Record
    if Quantity > 100 then

    Discount = 20


    if Quantity > 12 then

    Discount = 10



    Total = Price* Quantity
    Total = Total - (Discount* Total)/100
    Print Total


    >> Example 2


    Read Student_Marks_File
    Pass = 0
    Fail = 0
    Total = 0
    X = 0
    while (End Of Student_Marks_File) do

    Total = Total + Subject_Marks

    if (Subject_Marks > 40) then

    Print "Student passed in" Subject


    Print "Student failed in" Subject

    X = X +1
    Read Next Record

    Average = Total/X
    Print "Average Marks of" Student_Name "are" Average


    From the above examples of pseudocode containing control structures, analyze the logic implemented in the pseudocode.

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    Solution Preview

    First, some basic definition taken from http://www.cs.cornell.edu/Courses/cs482/2003su/handouts/pseudocode.pdf

    "Algorithms will often be expressed in pseudocode, a mixture of code and English ... Pseudocode strikes a sometimes precarious balance between the understandability and informality of English and the precision of code."

    (it's worth reading the whole PDF by the way).

    Keep in mind that unlike a programming language where there's a defined syntax, no 'standard' way exists in writing pseudocode. The key point to keep in mind when writing one is clarity and readability while being able to convey the essence of the algorithm outlined.

    That said, the following is the analysis of pseudocode in example 1:

    1. (Stating the obvious) It can be seen that a pseudocode block is enclosed within the start and stop commands.
    2. The next block of the algorithm

    read Customer_Order_Record

    performs reading of some "Customer_Order_Record" from somewhere. Notice here that the pseudocode is kept high-level and does not specify the exact mechanism of how to perform this reading and from where. The input could be read, for instance, from some IO stream off the disk or input typed by the user from the console or some data streamed from the network. The specific details are left out for implementation.

    3. The next conditional statement

    if Quantity > 100 then

    Discount = 20 ...

    Solution Summary

    The solution analyzes pseudocodes.