How do you program a calculator in UNIX using shell programming?

Answer 1

do(

echo"welcome to calculator press x to exit"

echo"enter 1st no:"

read a

echo"enter operator(+,-,*,/,%):"

read o

echo "enter 2nd no:"

read b

if["$o"="+"];

then

ans=($a+$b);

if["$o"="-"];

then

ans=($a-$b);

if["$o"="*"];

then

ans=($a*$b);

if["$o"="/"];

then

ans=($a/$b);

if["$o"="%"];

then

ans=($a%$b);

)while[$!='x']

echo "answer is:$ans";

done