Unix Shell Programming Example for B.Sc, B.Tech, BCA, MCA

 7. Prime number checking.

PROGRAM:

echo "enter a number:"

read n

    c=0

    d=1

    while [ $d -le $n ]

    do

        if [ `expr $n \% $d` -eq 0 ]

        then

            c=`expr $c + 1`

        fi

        d=`expr $d + 1`

    done

if [ $c -eq 2 ]

then

    echo "prime number"

else

    echo "not a prime number"   

fi

OUTPUT:

[bgc@localhost ~]$ sh 8.sh

enter a number:

2

prime number

[bgc@localhost ~]$ sh 8.sh

enter a number:

1

not a prime number

[bgc@localhost ~]$ sh 8.sh

enter a number:

0

not a prime number

[bgc@localhost ~]$ sh 8.sh

enter a number:

5

prime number

[bgc@localhost ~]$ sh 8.sh

enter a number:

4

not a prime number

[bgc@localhost ~]$