W.A.S.S to find the factorial of a given number.

Program

# W.A.S.S to find the factorial of a given number.
  

echo -e "enter number:\c"            #  \c Suppress trailing newline, –e Backslash-escaped
 #  characters  is enabled
read number
i=1
f=1

while test $i -le $number
do
f=`expr $f \* $i`                     # expression is written in back quote because it will produce output at
     # runtime
i=`expr $i + 1`
done                                       # ‘done’ is completion of while loop

echo "factorial of number is:$f"

Output

enter number:4
factorial of number is:24