Arithmatic operations, factorial of a number, while loop, prime number, etc

 

 

 

EX.NO:4.aARITHMETIC OPERATIONS USING CASE

Aim:

To write a shell program to perform the arithmetic operations using case

Algorithm :

 

Step 1 : Read the input variables and assign the value

Step 2 : Print the various arithmetic operations which we are going to perform

Step 3 : Using the case operator assign the various functions for the arithmetic

operators.

Step 4 : Check the values for all the corresponding operations.

Step 5 : Print the result and stop the execution.

.

Program code:   echo 1.Addition echo 2.Subraction echo 3.Multiplication echo 4.Division echo Enter your choice read a echo Enter the value of b read b echo Enter the value of c read c echo b is $b c is $c case $a in 1)d=`expr $b + $c` echo the sum is $d ;; 2)d=`expr $b - $c` echo the difference is $d ;; 3)d=`expr $b \* $c` echo the product is $d ;; 4)d=`expr $b / $c` echo the quotient is $d ;; esac

Sample I/P : 1.Addition 2.Subraction 3.Multiplication Division Enter your choice:1 Enter the value of b:3 Enter the value of c:4 b is 3 c is 4 the sum is 7 Sample O/P: b is 3 c is 4 the sum is 7

 

RESULT:Thus the program was executed and verified successfully

 

VIVA-VOCE QUESTIONS:

1. What is case statement in Linux?

2. What does esac do in Linux?

 

 

 

 

EX.NO:4.bARITHMETIC OPERATIONS USING CASE

Aim:

To write a shell program to list of file, list of process ,list of user login using case.

 

Algorithm :

Step 1 : Read the input variables and assign the value

Step 2 : Print the various list of file ,process and user log in which we are going to perform

Step 3 :Using the case operator assign the various  linux command for list of file,process and user login.

Step 4 : Print the result and stop the execution.

 

Program Code:   

clear

echo 1. list of file

echo 2. list of process

echo 3. list of user login

readval

case $val in

1)ls

echo " list of files are"

;;

2)ps

echo "list of process are"

;;

3)who

echo " list of users are"

;;

esac

 

Sample O/P:

1. list of file

2. list of process

3. list of user login

Result :

Thus the shell program to perform arithmetic operations using case is executed and output is verified successfully

 

VIVA-VOCE QUESTIONS:

1. What is case statement in Linux?

2. What does esac do in Linux?

 

 

 

 

 

 

 

 

EX.NO:4.cFACTORIAL OF A NUMBER

Aim:

To write a shell program to find the factorial of a number.

Algorithm:

step 1. Start
step 2. Read the number x
step 3. [Initialize]
        i=1, fact=1
step 4. Repeat step 4 through 6 until i=x
step 5. fact=fact*i
step 6. i=i+1
step 7. Print fact
step 8. Stop

 

Program Code:   

            clear

echo " enter any no"

read x

f=1

for((i=1;i<=x;i++))

do

f=`expr $f  \* $i`

done

echo "factorial of $x is $f"

 

Sample O/P:

 

Enter any no

5

factorial of $x is 120

 

 

 

RESULT:Thus the program was executed and verified successfully

 

VIVA-VOCE QUESTIONS:

1. What is a factorial and what is its purpose?

2. What is the use of “expr” in Linux?.

3. What are the symbols for multiplication with expr in shell script?

 

 

 

 

 

 

 

 

 

 

EX.NO:4.d USING WHILE LOOP AND UNTIL LOOP

Aim:

To write a shell program to print from 1 to 10 using while loop and then using until loop.

Algorithm :

 

step 1. Start
step 2. [Initialize] The variable i  is initialized with value 0 and then it has been tested for the condition.
step3: If the condition returns true then the statements inside the body of while loop are executed else control comes out of the loop.
step4.: value of count is incremented using ++ operator then it has been tested again for the loop condition.

Step5: Print i

Step6:Stop

 

Using while loop:                                             Program Code:    clear i=0 while [ $i -le 10 ] do i=`expr $i + 1` echo "$i" done Sample O/P:   1 2 3 4 5 6 7 8 9 10

Using until loop: Program Code:    clear val=1 until [ $val -gt 10 ] do echo $val let val=val+1 done esc done Sample O/P: 1 2 3 4 5 6 7 8 9            10

 

RESULT:

Thus the program was executed and verified successfully

VIVA-VOCE QUESTIONS:

1. What is loop?

2. What are different types of loop?

3. What is entry control loop?

4. Write syntax of while-loop.

5. What is event control loop

 

EX.NO:4.ePRIME NUMBER

Aim:

To write a shell program whether a number prime or not.

Algorithm :

 

   Step 1:START

   Step 2:Take integer variable A

   Step 3 :Divide the variable A with (A-1 to 2)

   Step 4:  If A is divisible by any value (A-1 to 2) it is not prime

   Step 5 :Else it is prime

   Step 5 : STOP

 

Program Code:   

clear

echo " Enter the no"

read a

c=0

for((i=2;i<a;i++))

do

let n=a%i

if [ $n -eq 0 ]

then

c=1

fi

done

if [ $c -eq 1 ]

then

echo "not a prime"

else

echo " prime"

fi

 

Sample I/P :

Enter the no: 53

 

Sample O/P:

prime

Result :

Thus the shell program to find the Prime number is executed and output is verified successfully.

 

VIVA-VOCE QUESTIONS:

1. What is prime number?

2. Write syntax of for-loop.

3. Can Prime Numbers be Negative?

4. What is “–eq”  in shell script?

 

 

 

EX.NO:4.fFIBONACCI SERIES

Aim:

To write a shell progrm to generate Fibonacci series.

Algorithm :

Step 1 :Initialise a to 0 and b to 1.

Step 2 : Print the values of 'a' and 'b'.

Step 3 : Add the values of 'a' and 'b'. Store the added value in variable 'c'.

Step 4 : Print the value of 'c'.

Step 5 :Initialise 'a' to 'b' and 'b' to 'c'.

Step 6 : Repeat the steps 3,4,5 till the value of 'a' is less than 10.

Program code:

echo enter the number

read n

a=-1

b=1

i=0

while [ $i –le $n ]

do

t=`expr $a + $b`

echo $t

a=$b

b=$t

i=`expr $i + 1

done

Sample I/P :

Enter the no: 5

Sample O/P:

0

1

1

2

3

5

Result :

Thus the shell program to find the Fibonacci series is executed and output is verified successfully.

 

 

VIVA-VOCE QUESTIONS:

 

1. What is Fibonacci series?

2. Why is Fibonacci important??

3. What are the real life applications of Fibonacci series?

4.What is "-le" in shell script?

 

 

 

 

 

EX.NO:4.gARMSTRONG NUMBER

Aim:

To write a shell program whether a check Armstrong number.

Algorithm :

Step 1:  Start

Step 2:  read number

Step 3:  set sum=0 and duplicate=number

Step 4:  reminder=number%10

Step 5:  sum=sum+(reminder*reminder*reminder)

Step 6:  number=number/10

Step 7:  repeat steps 4 to 6 until number > 0

Step 8:  if sum = duplicate

Step 9:  display number is Armstrong

Step 10:                  else 

Step 11:                  display number is not armstrong

Step 12:                  stop

Step 13:                   

Program Code: echo “Enter a number: “  read a x=$a sum=0 r=0 n=0 While[ $x –gt 0 ] do r=`expr $x % 10` n= `expr $r \* $r \* $r` sum= `expr $sum + $n` x=`expr $x / 10` done if[ $sum –eq    $a ] then echo “It ia an Armstrong No” else echo “It ia not an Armstrong No” fi

Sample O/P: Enter a number: 153 It ia an Armstrong No

Result :

Thus the shell program to find the Armstrong No is executed and output is verified successfully

 

VIVA-VOCE QUESTIONS:

1. What is meant by Armstrong number?

2. Is 5 an Armstrong number?

3. Is 0 an Armstrong number?

4. Write syntax of while-loop.

5. Write syntax of if function.

EX.NO:4.hNATURAL NUMBER