1st PUC COMPUTER SCIENCE LAB PROGRAMS PDF | class 11 computer science lab manual | 1st puc computer science programs

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        1.       Write a program to swap two numbers using a third variable.

        Algorithm:

        Step 1: START

        Step 2: Input the first number → store it in a

        Step 3: Input the second number → store it in b

        Step 4: Display a and b before swapping

        Step 5: Set temp = a

        Step 6: Set a = b

        Step 7: Set b = temp

        Step 8: Display a and b after swapping

        Step 9: STOP

        Flowchart:

a=int(input("Enter the value of a:"))

b=int(input("Enter the value of b:"))

print("Before swapping a=",a," and b=",b)

temp=a

a=b

b=temp

print("After swapping a=",a," and b=",b)

Watch Explainer Video Here

1.           2. Write a program to enter two integers and perform all arithmetic operations on them.

        Algorithm:

        Step 1: Start

        Step 2: Input the first number and store it in variable a

        Step 3: Input the second number and store it in variable b

        Step 4: Compute sum = a + b

        Step 5: Compute diff = a - b

        Step 6: Compute prod = a * b

        Step 7: Compute divi = a // b

        Step 8: Compute modulus = a % b

        Step 9: Print "Addition =", sum

        Step 10: Print "Subtraction =", diff

        Step 11: Print "Multiplication =", prod

        Step 12: Print "Division =", divi

        Step 13: Print "Modulus =", modulus

        Step 14: Stop

        Flowchart:

        

a=int(input("Enter the value of a:"))

b=int(input("Enter the value of b:"))

sum=a+b

diff=a-b

prod=a*b

divi=int(a/b)

modulus=a%b

print("Addition=", sum)

print("Subtraction=",diff)

print("Multiplication=",prod)

print("Division=",divi)

print("Modulus=",modulus)

Watch Explainer Video Here

1.           3. Write a Python program to accept length and width of a rectangle and compute its perimeter and area.

        Algorithm: 

        Step 1: Start

        Step 2: Input the length of the rectangle and store it in l

        Step 3: Input the width of the rectangle and store it in w

        Step 4: Calculate the area using formula area = l * w

        Step 5: Calculate the perimeter using formula perimeter = 2 * (l + w)

        Step 6: Display the value of area

        Step 7: Display the value of perimeter

        Step 8: Stop

        Flowchart:

        

l=float(input("Enter the length of the rectangle:"))

w=float(input("Enter the width of the rectangle:"))

area=l*w

perimeter=2*(l+w)

print("Area of rectangle=",area)

print("Perimeter of rectangle=",perimeter)

Watch Explainer Video Here

        4.  Write a python program to calculate the amount payable if money has been lent on simple interest. Principal or money lent=P, Rate of interest =R% per annum and Time =T years. Then simple interest (SI) =PxTxR/100. Amount payable=Principal+SI. P,R and T are given as input to the program.

        Algorithm: 

        Step 1: START

        Step 2: INPUT principal amount and store it in variable P

        Step 3: INPUT time and store it in variable T

        Step 4: INPUT rate of interest and store it in variable R

        Step 5: COMPUTE Simple Interest using the formula:

                SI = (P × T × R) / 100

        Step 6: PRINT Simple Interest (SI)

        Step 7: STOP

        Flowchart:

p=float(input("Enter the principal amount:"))

t=float(input("Enter the time:"))

r=float(input("Enter the rate of interest:"))

si=p*t*r/100

print("Simple Interest=",si)

Watch Explainer Video Here

1.           5. Write a program to find the largest among three numbers.

        Algorithm: 

        Step 1: Start

        Step 2: Input the first number and store it in variable a

        Step 3: Input the second number and store it in variable b

        Step 4: Input the third number and store it in variable c

        Step 5: If a is greater than or equal to both b and c, then

       Set large = a

        Step 6: Else if b is greater than or equal to both a and c, then

       Set large = b

        Step 7: Else

       Set large = c

        Step 8: Print the value of large

        Step 9: Stop

        Flowchart:

a=float(input("Enter the value of a:"))

b=float(input("Enter the value of b:"))

c=float(input("Enter the value of c:"))

if(a>=b)and(a>=c):

              large=a

elif(b>=a)and(b>=c):

    large=b

else:

              large=c

print("The largest number=",large)

Watch Explainer Video Here

      

    6. Write a program that takes the name and age of the user as input and displays a message whether the user is eligible to apply for a driving license or not. (The eligible age is 18 years).

        Algorithm: 

        Step 1: START

        Step 2: INPUT name

        Step 3: INPUT age

        Step 4: IF age >= 18 THEN

                           PRINT "Hello, <name>! You are eligible."

                    ELSE

                           PRINT "Sorry, <name>. You are not eligible yet."

        Step 5: STOP

        Flowchart:

name=input("Enter your name: ")

age=int(input("Enter your age: "))

if age>=18:

              print("Hello, ",name," ! You are eligible.")

else:

              print("Sorry, ",name,". You are not eligible yet.")

Watch Explainer Video Here

      

    7. Write a program that prints minimum and maximum of five numbers entered by the user.

        Algorithm: 

        Step 1: START

        Step 2: SET small = 0, large = 0

        Step 3: REPEAT steps 4 to 7 for i = 1 to 5

        Step 4: INPUT a number and store it in 'a'

        Step 5: IF i = 1 THEN

                      SET small = a

                      SET large = a

        Step 6: IF a < small THEN

                      SET small = a

        Step 7: IF a > large THEN

                       SET large = a

        Step 8: PRINT "Smallest number = ", small

        Step 9: PRINT "Largest number = ", large

        Step 10: STOP

        Flowchart:

    

small=0

large=0

for i in range(0,5):

    a=int(input("Enter the number "+str(i+1)+":"))

    if i==0:

        small=large=a

    if(a<small):

        small=a

    if(a>large):

        large=a

print("Smallest number=",small)

print("Largest number=",large)

Watch Explainer Video Here

        8. Write a python program to find the grade of a student when grades are allocated as given in the table below.

Above 90%         A

80% to 90%        B

70% to 80%        C

60% to 70%        D

Below 60%         E

Percentage of the marks obtained by the student is input to the program.

Algorithm: 

Step 1: Start

Step 2: Input the percentage and store it in variable p

Step 3: If p > 90, then

  Print "Grade A"

Step 4: Else if p > 80, then

  Print "Grade B"

Step 5: Else if p > 70, then

  Print "Grade C"

Step 6: Else if p > 60, then

  Print "Grade D"

Step 7: Else

  Print "Grade E"

Step 8: Stop

Flowchart:

 

p=float(input("Enter the percentage: "))

if(p>90):

              print("Grade A")

elif(p>80):

              print("Grade B")

elif(p>70):

              print("Grade C")

elif(p>60):

              print("Grade D")

else:

              print("Grade E")

Watch Explainer Video Here

1.       9. Write a function to print the table of a given number. The number has to be entered by the user.

        Algorithm: 

        Start

        Step 1: Input a number and store it in variable a

        Step 2: Set i = 1

        Step 3: Repeat steps 4 to 6 while i <= 10

        Step 4: Compute b = a * i

        Step 5: Display the result in the format a x i = b

        Step 6: Increment the value of i by 1

        Stop

        Flowchart:

a=int(input("Enter the number: "))

i=1

while i<=10:

              b=a*i

              print(a,'x',i,'=',b)

              i=i+1

Watch Explainer Video Here

1.       10. Write a program to find the sum of digits of an integer number, input by the user.

        Algorithm: 

        Step 1: Start

        Step 2: INPUT the number and store in variable n

        Step 3: SET sum = 0

        Step 4: WHILE n > 0, repeat Steps 5 to 7

        Step 5: rem = n % 10 ← (Get the last digit)

        Step 6: sum = sum + rem ← (Add the digit to sum)

        Step 7: n = n // 10 ← (Remove the last digit)

        Step 8: PRINT "The sum of digits =", sum

        Step 9: Stop

        Flowchart:

n=int(input("Enter the number: "))

sum=0

while n>0:

              rem=n%10

              sum=sum+rem

              n=n//10

print("The sum of digits=",sum)

Watch Explainer Video Here

1.       11. Write a program to check whether an input number is a palindrome or not.

        Algorithm: 

        Step 1: START

        Step 2: Input a number and store it in variable n

        Step 3: Store the value of n in another variable temp (for comparison later)

        Step 4: Set rev = 0 to store the reversed number

        Step 5: Repeat the following steps while n > 0:

          a) Find the last digit using digit = n % 10

          b) Add this digit to rev by shifting existing digits: rev = rev * 10 + digit

          c) Remove the last digit from n using n = n // 10

        Step 6: After the loop ends, compare temp and rev:

          If temp == rev then

            PRINT "It is a palindrome"

          Else

            PRINT "It is not a palindrome"

        Step 7: STOP

        Flowchart:

n=int(input("Enter a number: "))

temp=n

rev=0

while(n>0):

              digit=n%10

              rev=rev*10+digit

              n=n//10

if(temp==rev):

              print("It is a palindrome")

else:

              print("It is not a palindrome")

Watch Explainer Video Here

1.       12. Write a program to print the following patterns:

1 2 3 4 5

1 2 3 4

1 2 3

1 2

1

Algorithm: 

Step 1: Start

Step 2: Input the number of rows (n)

Step 3: Repeat steps 4 to 6 while i goes from n to 1

Step 4: Set j = 1

Step 5: Repeat step 6 while j <= i

Step 6: Print j and increment j by 1

Step 7: Move to the next line

Step 8: Decrease i by 1 and repeat

Step 9: Stop

Flowchart:

n=int(input("Enter the number of rows: "))

for i in range(n,0,-1):

    for j in range(1,i+1):

                  print(j,end=' ')

    print()

Watch Explainer Video Here

1.       13. Write a program that uses a user defined function that accepts name and gender (as M for male, F for Female) and prefixes Mr./Ms. Based on the gender.

        Algorithm: 

        Step 1: Start

        Step 2: Input name of the student

        Step 3: Input gender of the student

        Step 4: Check if gender is 'M' or 'm'

                → If yes, then display "Mr." followed by name

        Step 5: Otherwise, check if gender is 'F' or 'f'

                → If yes, then display "Ms." followed by name

        Step 6: Otherwise, display "Please enter only M or F in gender"

        Step 7: Stop

        Flowchart:

def  student(name,gender):

              if(gender=='M' or gender=='m'):

                             print('Mr.',name)

              elif(gender=='F' or gender=='f'):

                             print('Ms.',name)

              else:

                             print("Please enter only M or F in gender")

name=input("Enter the name: ")

gender=input("Enter the gender M for Male and F for Female: ")

student(name,gender)

Watch Explainer Video Here

1.       14. Write a program that has a user defined function in accept the coefficients of a quadratic equation in variables and calculates its determinant. For example : if the coefficients are stored in the variables a,b,c then calculate determinant as b² – 4ac. Write the appropriate condition to check determinants on positive, zero and negative and output appropriate result.

        Algorithm: 

        Step 1: Start

        Step 2: Input the value of a

        Step 3: Input the value of b

        Step 4: Input the value of c

        Step 5: Compute d = b² - 4 × a × c

        Step 6: If d > 0, then

           Print “The roots are real and different”

        Step 7: Else if d == 0, then

           Print “The roots are real and equal”

        Step 8: Else

           Print “The roots are imaginary”

        Step 9: Stop

a=int(input("Enter the value of a: "))

b=int(input("Enter the value of b: "))

c=int(input("Enter the value of c: "))

def disc(a,b,c):

              d=b**2-4*a*c

              return d

det=disc(a,b,c)

if(det>0):

              print("The roots are real and different")

elif(det==0):

              print("The roots are real and equal")

else:

              print("The roots are imaginary")

Watch Explainer Video Here

1.       15. Write a program that has a user defined function to accept 2 numbers as parameters, if number  is less than number 2 then numbers are swapped and returned, i.e., number 2 is returned in place of number 1 and number 1 is reformed in place of number 2, otherwise the same order is returned.

        Algorithm: 

        Step 1: START

        Step 2: Input the first number and store it in variable a

        Step 3: Input the second number and store it in variable b

        Step 4: Display the values of a and b before swapping

        Step 5: Check if a is less than b

           If YES, then set a = b and b = a

           If NO, keep a and b as it is

        Step 6: Display the values of a and b after swapping

        Step 7: STOP

def swap(a,b):

              if(a<b):

                             return b,a

              else:

                             return a,b

a=int(input("Enter the value of a: "))

b=int(input("Enter the value of b: "))

print("Before swapping a=",a," and b=",b)

a,b=swap(a,b)

print("After swapping a=",a," and b=",b)

Watch Explainer Video Here

16. Write a program to input line(s) of text from the user until enter is pressed. Count the total number of characters in the text (including white spaces), total number of alphabets, total number of digits , total number of special symbols and total number of words in the text. (Assume that each \word is separated by one space).

Algorithm: 

Step 1: START

Step 2: Input a string and store it in variable string

Step 3: Set l = length of string

Step 4: Set alpha = 0, digit = 0, special = 0, words = 1

Step 5: Repeat for each character ch in string:

    a) IF ch is an alphabet THEN

        INCREMENT alpha by 1

    b) ELSE IF ch is a digit THEN

        INCREMENT digit by 1

    c) ELSE IF ch is a space THEN

        INCREMENT words by 1

    d) ELSE

        INCREMENT special by 1

Step 6: PRINT "Total number of characters = ", l

Step 7: PRINT "Total number of alphabets = ", alpha

Step 8: PRINT "Total number of digits = ", digit

Step 9: PRINT "Total number of special characters = ", special

Step 10: PRINT "Total number of words = ", words

Step 11: STOP

string=input("Enter the string:")

l=len(string)

alpha=digit=special=0

words=1

for ch in string:

    if ch.isalpha():

        alpha+=1

    elif ch.isdigit():

        digit+=1

    elif ch.isspace():

        words+=1

    else:

        special+=1

print("Total number of characters:",l)

print("Total number of alphabets:",alpha)

print("Total number of digits:",digit)

print("Total number of Special Symbols:",special)

print("Total number of words:",words)

Watch Explainer Video Here

17.  Write a user defined function to convert a string with more than one word into title case string where string is passed as parameter. (Title case means that the first letter of each word is capitalized)

Algorithm: 

        Step 1: Start

        Step 2: Input a string and store it in variable name

        Step 3: Set variable space = 0

        Step 4: Repeat the following for each character in the string:

          IF the character is a space, then

            INCREMENT space by 1

        Step 5: IF the string is already in Title Case

            PRINT "The string is already in title case"

        Step 6: ELSE IF space is more than 0

            Convert the string to Title Case

            PRINT the converted string

        Step 7: ELSE

            PRINT "The string is in one word"

        Step 8: Stop

        Flowchart:

        def student(s):

    s1=s.title()

    print("The input string in title case is:",s1)

 

name=input("Enter the string:")

space=0

for b in name:

    if b.isspace():

        space+=1

if name.istitle():

    print("The string is already in title case")

elif space>0:

    student(name)

else:

    print("The string is in one word")

        Watch Explainer Video Here

        

18. Write a function that takes a sentence as an input parameter where each word in the sentence is separated by a space. The function should replace each blank with a hyphen and then return the modified sentence.

Algorithm: 

        Step 1: Start

        Step 2: Input a sentence from the user and store it in s1

        Step 3: Replace all spaces ' ' in the sentence with hyphens '-'

        Step 4: Store the new sentence in s2

        Step 5: Print s2 as the modified sentence

        Step 6: Stop

        Flowchart:

                def replace1(s):

                    return s.replace(' ','-')

                s1=input("Enter the sentence:")

                s2=replace1(s1)

                print("The modified sentence=",s2)

            Watch Explainer Video Here

            19.   Write a program to fund the number of times an element occurs in the list.

        Algorithm: 

        Step 1: Start

        Step 2: Store the numbers [10, 20, 10, 40, 50, 30, 10, 10, 50] in a list

        Step 3: Display all the elements of the list

        Step 4: Ask the user to enter a number (this is the number we want to count)

        Step 5: Count how many times the entered number appears in the list

        Step 6: Display the result showing how many times the number appears

        Step 7: Stop

        Flowchart:

            list=[10,20,10,40,50,30,10,10,50]

            print("Elements in the list are:",list)

            a=int(input("Enter the number to check how many times the element occurs in the list:"))

            b=list.count(a)

            print("An element ",a," is present ",b," times")

            Watch Explainer Video Here

            

            20. Write a function that returns the largest element of the list passed as parameter.

        Algorithm: 

         Step 1: Start

         Step 2: Create a list of numbers

         Step 3: Set a variable n = 0 to store the largest number temporarily

         Step 4: Repeat the following steps for each element in the list:

          a) Check if it's the first element or the current element is greater than n

          b) If yes, update the value of n with the current element

         Step 5: After the loop ends, n will hold the largest number

         Step 6: Display the list

         Step 7: Display the largest number

         Step 8: Stop

        Flowchart:

                

                def large(list):

                    n=0

                    for i in range(len(list)):

                        if(i==0 or list[i]>n):

                            n=list[i]

                    return n

                list=[10,20,30,40,50,60,70,80,90,100]

                max=large(list)

                print("The elemtns of the list are:",list)

            print("The largest number=",max)

                

                Watch Explainer Video Here

                

21. Write a program to read a list of elements. Modify this list so that it does not contain any duplicate elements, i.e. all elements occurring multiple times in the list should appear only once.

Algorithm: 

        Step 1: Start

        Step 2: Create an empty list called list

        Step 3: Input the number of elements, store in n

        Step 4: Display a message to enter the elements

        Step 5: Repeat steps 6–7 n times

        Step 6: Take an integer input a

        Step 7: Add a to the list

        Step 8: Display the original list

        Step 9: Create an empty list called newlist

        Step 10: Repeat steps 11–13 for every element in list

        Step 11: If the current element is not in newlist, then

        Step 12: Add that element to newlist

        Step 13: Continue to next element

        Step 14: Display newlist as the list without duplicates

        Step 15: Stop

        Flowchart:

                def dup(list):

                    newlist=[]

                    for a in range(len(list)):

                        if list[a] not in newlist:

                            newlist.append(list[a])

                    return newlist

 

                list=[]

                n=int(input("How many elements?"))

                print("Enter the elements:")

                for i in range(n):

                    a=int(input())

                    list.append(a)

                print("The numbers in list:",list)

                print("List without duplicate elements is:",dup(list))

                Watch Explainer Video Here

                

                22. Write a program to read email IDs of n number of students and store them in a tuple. Create two new tuples, one to store only the usernames from the email IDs and second to store domain names from the email IDs. Print all three tuples at the end of the program. [Hint: You may use the function split()]

        Algorithm: 

        Step 1: Start

        Step 2: Create an empty tuple named email

        Step 3: Create an empty tuple named username

        Step 4: Create an empty tuple named domainname

        Step 5: Ask the user how many email IDs they want to enter

        Step 6: Store the input number in variable n

        Step 7: Repeat the following steps from i = 1 to n:

          Step 7.1: Ask the user to input the i-th email ID and store it in variable eid

          Step 7.2: Add eid to the email tuple

          Step 7.3: Split eid at the “@” symbol

          Step 7.4: Take the first part (before @) and add it to the username tuple

          Step 7.5: Take the second part (after @) and add it to the domainname tuple

        Step 8: Print the tuple email

        Step 9: Print the tuple username

        Step 10: Print the tuple domainname

        Step 11: Stop    

        Flowchart:

                email=tuple()

                username=tuple()

                domainname=tuple()

                n=int(input("How many valid email IDs you want to enter? "))

                for i in range(n):

                    eid=input("Please enter email id"+str(i+1)+": ")

                    email+=(eid,)

                    e=eid.split("@")

                    username=username+(e[0],)

                    domainname=domainname+(e[1],)

                print("The IDs in the tuple:",email)

                print("The username of email ids are: ",username)

                print("The domain name of email ids are: ",domainname)

                Watch Explainer Video Here

                

                23. Write a program to input names of n students and store them in a tuple. Also, input a name from the user and find if this student is present in the tuple or not.

        Algorithm: 

        Step 1: START

        Step 2: Create an empty tuple called name

        Step 3: INPUT total number of names as n

        Step 4: Repeat Steps 5 to 6 n times

        Step 5: INPUT a name and store it in variable num

        Step 6: Add num to the tuple name

        Step 7: PRINT all names entered

        Step 8: INPUT the name to be searched and store it in search

        Step 9: IF search is in name THEN

          PRINT "Name is present"

        Step 10: ELSE

          PRINT "Name is not present"

        Step 11: STOP

        Flowchart:

                name=tuple()

                n=int(input("How many names do you want to enter?"))

                for i in range(n):

                    num=input("Enter the name"+str(i+1)+": ")

                    name=name+(num,)

                print("Names entered are:",name)

                search=input("Enter the name to be searched: ")

                if search in name:

                    print("Name",search,"is present")

                else:

                    print("Name",search,"is not present")

                Watch Explainer Video Here

                

                24. Write a program to create a dictionary from a string. Note: Track the count of the letters from the string. Sample string : ‘2^nd pu course’. Expected output : {‘ ‘:2,’2’:1,’n’:1,’d’:1,’o’:1,’p’:1.’u’:2,’c’:1,’s’:1,’r’:1.’e’:1}

         Algorithm: 

        Step 1: Start

        Step 2: Store the string "2nd pu course" in variable s

        Step 3: Create an empty dictionary called s1

        Step 4: Repeat steps 5–7 for each character in the string s:

  Step 5: If the character is already in the dictionary s1, then

              INCREMENT the count of that character by 1

  Step 6: Otherwise

           ADD the character to dictionary s1 with value 1

        Step 7: End of loop

        Step 8: Display the dictionary s1

        Step 9: Stop     

                s="2nd pu course"

                print("The input string is:",s)

                s1=dict()

                for character in s:

                    if character in s1:

                        s1[character]+=1

                    else:

                        s1[character]=1

                print("The dictionary created from characters of the string is:",s1)

            Watch Explainer Video Here