Help with infinite loop problem Post: 302548635

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Homework and Emergencies Homework & Coursework Questions Help with infinite loop problem Post 302548635 by Ren_kun on Friday 19th of August 2011 01:11:52 AM

08-19-2011

Registered User

Help with infinite loop problem

1. The problem statement, all variables and given/known data:
My problem is an infinite loop when i press any other key other then Y or y in the while loop. what i want it to do is return to the normal script outside of it if pressing N or n or keep asking the same question if its any other button. Perhaps my knowledge and understanding of loops is inaccurate. But i have made it very similar to the lecture shown ones and it isnt working out very well. Thanks in advance.

2. Relevant commands, code, scripts, algorithms:

P.S. I am using cygwin in windows to do this script.

3. The attempts at a solution (include all code and scripts):

Code:

"4")
clear
echo Would you like to exit? [y/n]?
read answer
while [ "$answer" != "Y" ] || [ "$answer" != "y" ]; do
        case "$answer" in
        "Y" | "y")  clear; exit ;;
        "N" | "n")
                echo Press enter to continue
                read a ;;
        *)
                echo Invalid input
                echo Press enter to continue...
                read a
                ;;
        esac
        if [ $answer != "Y" ] || [ "$answer" != "y" ]; then
        echo "Press enter to continue..."
        read A
        fi




done
;;

4. Insearch: (University of Technology Sydney), Sydney NSW, Australia, James Hu (web systems), www(dot)insearch.edu.au/default.aspx?ArticleID=430

Note: Without school/professor/course information, you will be banned if you post here! You must complete the entire template (not just parts of it).

Ren_kun

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LEARN ABOUT BSD

arithmetic

ARITHMETIC(6)							   Games Manual 						     ARITHMETIC(6)

NAME

       arithmetic - provide drill in number facts

SYNOPSIS

       /usr/games/arithmetic [ +-x/ ] [ range ]

DESCRIPTION

       Arithmetic types out simple arithmetic problems, and waits for an answer to be typed in.  If the answer is correct, it types back "Right!",
       and a new problem.  If the answer is wrong, it replies "What?", and waits for another answer.  After every twenty  problems,  it  publishes
       statistics on correctness and the time required to answer.

       To quit the program, type an interrupt (delete).

       The  first optional argument determines the kind of problem to be generated; +-x/ respectively cause addition, subtraction, multiplication,
       and division problems to be generated.  One or more characters can be given; if more than one is given, the  different  types  of  problems
       will be mixed in random order; default is +-.

       Range  is a decimal number; all addends, subtrahends, differences, multiplicands, divisors, and quotients will be less than or equal to the
       value of range.	Default range is 10.

       At the start, all numbers less than or equal to range are equally likely to appear.  If the respondent makes a mistake, the numbers in  the
       problem which was missed become more likely to reappear.

       As a matter of educational philosophy, the program will not give correct answers, since the learner should, in principle, be able to calcu-
       late them.  Thus the program is intended to provide drill for someone just past the first learning stage, not  to  teach  number  facts	de
       novo.  For almost all users, the relevant statistic should be time per problem, not percent correct.

7th Edition							    May 6, 1986 						     ARITHMETIC(6)

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