W.A.S.S to check that whether a given number is prime or not.

 Program

# W.A.S.S to check that whether a given number is prime or not.

 echo -e " enter  number \c"

read number

i=2

flag=0

while test $i -lt $number                            #starts from 2 to number-1

do

    if test `expr $number % $i` = 0            #if the no is completely divisible by i

    then

           flag=1

           break

    fi

    i=`expr $i + 1`

done

if test $flag = 0

then

    echo "Number is prime"

else

    echo "Number is not prime"

fi

Output

enter  number 55

Number is not prime

enter  number 13

Number is prime

enter  number 21

Number is not prime