In this HackerRank The World of Numbers problem solution Values can be read from the command line using the read command. See the following code.

read a

read b

echo $a

echo $b

Invoked from the command line:

echo '1\n2'|./read.sh

1

2

To perform an operation, surround the variables with (()) or [] and precede with a $ sign.

read a

read b

echo $[a+b]

echo $((a-b))

we have given two integers, X and Y, find their sum, difference, product, and quotient.

vHackerRank The World of Numbers problem solution


Problem solution.

read x
read y
echo $(expr $x + $y)
echo $(expr $x - $y)
echo $(expr $x \* $y)
echo $(expr $x / $y)


Second solution.

read x
read y
echo "$[ $x + $y]"
echo "$[ $x - $y]"
echo "$[ $x * $y]"
echo "$[ $x / $y]"