This is a UNIX script Using the c shell /bin/csh write the utility called myCalc

Question

This is a UNIX script Using the c shell /bin/csh write the utility called myCalc that satisfies the following specifications:

Usage: myCalc operand1 operator operand2

myCalc is a very simple calculator. operand1 and operand2 are integers. operator is the words plus, minus, div, and times. The operands and operators will be passed on the command line. Generate error messages if the operands are not valid or the operator is not valid. If no arguments are passed show the usage statement. Example of what the command line will look like:

>myCalc 2 plus 3

>The answer is 5

Explanation / Answer

clear

sum=0

i="y"

echo " Enter one no."

read n1

echo "Enter second no."

read n2

while [ $i = "y" ]

do

echo "1.Addition"

echo "2.Subtraction"

echo "3.Multiplication"

echo "4.Division"

echo "Enter your choice"

read ch

case $ch in

    plus)sum=`expr $n1 + $n2`

     echo "Sum ="$sum;;

    minus)sum=`expr $n1 - $n2`

     echo "Sub = "$sum;;

    mul)sum=`expr $n1 * $n2`

     echo "Mul = "$sum;;

    div)sum=`expr $n1 / $n2`

     echo "Div = "$sum;;

    *)echo "Invalid choice";;

esac

echo "Do u want to continue ?"

read i

if [ $i != "y" ]

then

    exit

fi

done   

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