SenecaComputer.com

Create a more complex number guessing game using the "if construct" and nested loops

This is a Linux shell script for a more complex number guessing game.  The game generates a random number between 1 and 10.  The player has five chances to guess this random number.  After a successful guess or five unsuccessful guesses, the game does not exit, but allows the user to play again. 

This probably not a practical game, but it is intended to serve as a fun scripting exercise.  This script uses the "if construct" for decision making.  However it differs from game 1 and game 2 as the guess loop is nested inside a second "while construct" loop that allows the user to play 100 games before the game exits to the command prompt.

Either download the script here, or copy the text below and create a script with your favorite Linux text editor.

#!/bin/bash ######################################################################################################### #                                                                                                       # #                                              game3.sh                                                 # #                                                                                                       # # This is a number guessing game.  The user has 5 chances to guess a random number between 1 and 10.    # #                                                                                                       # # The game will only accept valid numerical numbers between 1 and 10.  Invalid input guesses will count # # towards the 5 guesses.                                                                                # #                                                                                                       # # This program will permit multiple plays without exiting to bash shell command prompt.                 # #                                                                                                       # #                                                                                                       # #########################################################################################################   clear                                            # clear the screen GAMEON=no                                        # sets $GAMEON to no GAMECOUNT=0                                      # set game counter to zero while [ $GAMECOUNT -lt 100 ]                     # start game counter loop - can play 100 times do   ANSWER=0                                       # set $ANSWER to 0 value   if [ $GAMEON = yes ]                           # if a game has already has been played     then       echo -e "That was game number "$GAMECOUNT".  Would you like to play again? (y/n)--> \c"     else                                         # if this is the first game       echo -e "Would you like to play a game? (y/n)--> \c"   fi   read ANSWER                                    # should be y or n response   if [ $ANSWER = y -o $ANSWER = Y -o $ANSWER = n -o $ANSWER = N ]    # check for valid response     then     if [ $ANSWER = y -o $ANSWER = Y ]            # if response is y       then       GAMEON=yes                                 # set $GAMEON to yes, indicates games have started       GAMECOUNT=`expr $GAMECOUNT + 1`            # increment game counter up 1 count       clear                                      # clear the screen       echo -e "This is a number guessing game.  You have 5 trys at guessing a number between 1 and 10. \n"       SECRET=$((RANDOM%10+1))                    # generate a random number between 1 and 10       COUNTER=0                                  # set guess counter to zero       while [ $COUNTER -lt 5 ]                   # start guess loop       do         echo -e "Enter a number from 1 to 10: \c"   # get user guess input         read INPUT         COUNTER=`expr $COUNTER + 1`              # increment guess counter up 1 count         echo                                     # echo blank line to screen         if [ $INPUT -lt 11 -a $INPUT -gt 0 ] 2>/dev/null  # check for valid numerical input from 1 to 10           then                                   # if good input, proceed             if [ $SECRET = $INPUT ]              # check for correct guess               then echo -e "Good job, that's correct.  You got it on guess number $COUNTER. \n"               COUNTER=10                         # set $COUNTER to 10 to indicate game won             elif [ $INPUT -lt $SECRET ]          # check for too low guess               then echo -e "That was guess number "$COUNTER".  You guessed too low \n"             elif [ $INPUT -gt $SECRET ]          # check for too high guess               then echo -e "That was guess number "$COUNTER".  You guessed too high \n"             fi           else                                   # if bad input, tell user             echo -e "That was guess number "$COUNTER" but you entered "$INPUT "which is not a number between 1 and 10 \n"         fi         if [ $COUNTER -eq 10 ]                   # game was won, reset for next game           then echo                              # send blank line to screen            elif [ $COUNTER -eq 5 ]                  # check guess counter, if 5th guess tell user game over           then echo -e "Sorry, that was your last guess.  Game over. \n"         else echo -e "Try again. \c"             # if guess was too low or too high         fi       done                                       # finishes guess loop     elif  [ $ANSWER = n -o $ANSWER = N ]         # user does not to start game or play again       then         if [ $GAMEON = yes ]                     # if user played the game           then             clear                                # clear the screen             echo -e "\nGoodby, thanks for playing my game, I hope you had fun. \n"             exit                                 # terminates program         else                                     # if user does not want to start game             clear                                # clear the screen             echo -e "\nI hope you will come back later and play. \n"             exit                                 # terminates program         fi     fi        elif [ ! $ANSWER = n -o ! $ANSWER = N ]      # if bad input from user          then echo -e "\nYou did not answer y or n, please try again. \n"   fi done                                             # finishes game loop

Name the script file "game3.sh", and make it executable for the user with the command:

chmod u+rwx game3.sh

Back to Scripts Page

Back to Seneca Computer Home Page

Page created April 26, 2012