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Homework and Emergencies Homework & Coursework Questions Creating a calculator with condition Post 303007716 by mugiboya on Monday 20th of November 2017 04:05:59 PM
Old 11-20-2017
Creating a calculator with condition

Use and complete the template provided. The entire template must be completed. If you don't, your post may be deleted!

1. The problem statement, all variables and given/known data:

Create a calculator application in your home folder called itncacl that will perform the following applications:

Add two numbers
Subtract two numbers
Multiply two numbers
Divide two numbers
You cannot divide by zero, so create a condition that checks for and prevents a that condition.

2. Relevant commands, code, scripts, algorithms:



3. The attempts at a solution (include all code and scripts):
Code:
#!/bin/bash

clear


echo "Enter the first number:"
read n1

echo "Choose an operation:"
echo "1. add"
echo "2. subtract"
echo "3. multiply"
echo "4. divide"
read opr

echo "Enter the second number:"
read n2

if [ $opr = "1" ]
   then
      echo $((n1+n2))
elif [ $opr = "2" ]
   then
      echo $((n1-n2))
elif [ $opr = "3" ]
   then
      echo $((n1*n2))
elif [ $opr = "4" ]
   then
       echo $((n1/n2))
fi
exit 0

My only question is how do I add to my code so that when I try to divide by zero it will show Cannot divide by zero or invalid? Thanks!

4. Complete Name of School (University), City (State), Country, Name of Professor, and Course Number (Link to Course):
Northern Virginia Comm College, VA, USA, Saleh, ITN171

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).

Last edited by Scott; 11-20-2017 at 05:07 PM.. Reason: Please use code tags
 

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So have I got this : #!/bin/bash clear echo "Enter the first number:" read n1 echo "Choose an operation:" echo "1. add" echo "2. subtract" echo "3. multiply" echo "4. divide" read opr echo "Enter the second number:" read n2 (1 Reply)
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echo(1B)					     SunOS/BSD Compatibility Package Commands						  echo(1B)

NAME
echo - echo arguments to standard output SYNOPSIS
/usr/ucb/echo [-n] [argument] DESCRIPTION
echo writes its arguments, separated by BLANKs and terminated by a NEWLINE, to the standard output. echo is useful for producing diagnostics in command files and for sending known data into a pipe, and for displaying the contents of envi- ronment variables. For example, you can use echo to determine how many subdirectories below the root directory (/) is your current directory, as follows: o echo your current-working-directory's full pathname o pipe the output through tr to translate the path's embedded slash-characters into space-characters o pipe that output through wc -w for a count of the names in your path. example% /usr/bin/echo "echo $PWD | tr '/' ' ' | wc -w" See tr(1) and wc(1) for their functionality. The shells csh(1), ksh(1), and sh(1), each have an echo built-in command, which, by default, will have precedence, and will be invoked if the user calls echo without a full pathname. /usr/ucb/echo and csh's echo() have an -n option, but do not understand back-slashed escape characters. sh's echo(), ksh's echo(), and /usr/bin/echo, on the other hand, understand the black-slashed escape characters, and ksh's echo() also understands a as the audible bell character; however, these commands do not have an -n option. OPTIONS
-n Do not add the NEWLINE to the output. ATTRIBUTES
See attributes(5) for descriptions of the following attributes: +-----------------------------+-----------------------------+ | ATTRIBUTE TYPE | ATTRIBUTE VALUE | +-----------------------------+-----------------------------+ |Availability |SUNWscpu | +-----------------------------+-----------------------------+ SEE ALSO
csh(1), echo(1), ksh(1), sh(1), tr(1), wc(1), attributes(5) NOTES
The -n option is a transition aid for BSD applications, and may not be supported in future releases. SunOS 5.10 3 Aug 1994 echo(1B)
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