Unix

1. #This is the script for the calculator

input="yes"

while [[ $input = "yes" ]]

do

echo "------------"

echo "Unix Calculator"

echo "------------"

# User are given options on what they want to do and the these

# are the different scripts for the math

PS3="Press a for Addition, s for subtraction, m for multiplication and d for division: "

select math in Addition Subtraction Multiplication Division

do

case "$math" in

Addition)

echo "Enter first no:"

read num1

echo "Enter second no:"

read num2

result=`expr $num1 + $num2`

echo Answer: $result

break

;;

Subtraction)

echo "Enter first no:"

read num1

echo "Enter second no:"

read num2

result=`expr $num1 - $num2`

echo Answer: $result

break

;;

Multiplication)

echo "Enter first no:"

read num1

echo "Enter second no:"

read num2

result=`expr $num1 * $num2`

echo Answer: $result

break

;;

Division)

echo "Enter first no:"

read num1

echo "Enter second no:"

read num2

result=$(expr "scale=2; $num1/$num2" | bc)

echo Answer = $result

break

;;

#This portion of script is used when the available options

#are not selected...