CS201
Lab 5 - Looping, looping, and even more of looping...

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Objectives:

• Design and implement an algorithm using nested loops. 
• Learn to use both while and for loops.

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Readings:

• Read Chapter 5 in the Hanly/Koffman text.

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Deliverables: (DUE BY THE END OF LAB!)

• Submittal of your algorithm and two files: lab5.c and Makefile.
• The algorithm needs to be provided in the form of the flowchart, which was introduced during the lecture on Top-Down Design with Functions. You can draw the symbols by hand, or use any type of software with diagram-drawing capabilities (e.g. MS Visio, or some free ones: OpenOffice.org Draw, Dia). Your program’s code needs to match the algorithm you submitted.

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TO DO (for today's lab)

• “Palindrome” in our exercise is a string of digits that can be read the same way in the either direction. Examples of palindromes are: 01210, or 0123210.
• Design a program to display palindrome.
• For instance, suppose that we have an input file with 5 on the first line. This is the output, we are expecting:

The Palindrome of 5 is:

0

0 1 0

0 1 2 1 0

0 1 2 3 2 1 0

0 1 2 3 4 3 2 1 0

0 1 2 3 4 5 4 3 2 1 0

• The version below (generated for an input file with 4 in it) indicates that you need to put one blank space between every two numbers ( “b” represents the blank space):

The Palindrome of 4 is:

0

0b1b0

0b1b2b1b0

0b1b2b3b2b1b0

0b1b2b3b4b3b2b1b0

• Write a C program solving that problem.                                            
• Use fscanf to get your palindrome size (an integer number) from your input file datain5.
• Use both the while and for statements, and implement the solution using a nested loop.
• Note: you will lose 50% of your total if you use only one type of loop in your program).
• You DO NOT need to provide your datain5 file since we can test your program with our own files.

LAB 5 ENRICHMENT

• Rewrite your code using do-while loop (where condition is checked at the end of the loop).
• Rewrite your code in such way that you do not use neither “<=” nor “>=” relational operators (you are allowed to use “<” or some other operators).
• Can you generate the same output, when using only decremented counters (e.g. i = i - 1)? How about using only prefix decrements (e.g. --i)?
• Can you rewrite your program in such way that it would print out palindromes for multiple numbers stored in the same input file? Think about using endfile-controlled loop (with EOF) .