Xi CBSE Computer Science lab programs

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Prof. K. Adisesha Page 1
COMPUTER SCIENCE
PYTHON PRACTICAL PROGRAMS
1. Program to obtain length and breadth of a rectangle and calculate its area.
Solution.
#to input length and breadth of a rectangle and calculate its area
length = float( input("Enter length of the rectangle : "))
breadth= float( input (" Enter breadth of the rectangle: "))
area=length * breadth
print ("Rectangle specifications ")
print ("Length = ", length)
print ("breadth ", breadth)
print ("Area = ", area)
2. Write a program in python to display even and odd numbers from 1 to N.
Solution.
num=int(input("Enter the Range:"))
for i in range(1,num+1):
if i%2==0:
print(i, "is even number")
else:
print(i,"is odd number")
3. Write a program in python to all print prime number from 1 to n.
Solution.
num=int(input("Enter the number:"))
for val in range(1,num + 1):
# If num is divisible by any number
# between 2 and num, it is not prime

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if num > 1:
for n in range(2, val):
if (val % n) == 0:
break
else:
print(val)
4. Write Python script to print the following for n numbers pattern:
1
1 3
1 3 5
1 3 5 7
Solution.
num=int(input("Enter the number:"))
for a in range (2, num, 2):
for b in range (1, a, 2):
print (b, end =(' '))
print ()
5. Write a program to find sum of the series: S=1+ X + X2
+X3
+….Xn
Solution.
x = int ( input ( "Enter value of X :" ) )
n= int (input( "Enter value of n (for x ** y) :" ))
s=0
for a in range(n):
s += x ** a
print ("Sum of first" , x,'^',a , "terms :", s)

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6. Write a program to check a number whether it is palindrome or not.
num=int(input("Enter a number : "))
n=num
res=0
while num>0:
rem=num%10
res=rem+res*10
num=num//10
if res==n:
print(n,": Number is Palindrome")
else:
print(n, ": Number is not Palindrome")
7. Write a program to test if a string is palindrome or not.
SOURCE CODE:
string = input("Please enter your own String : ")
if(string == string[:: - 1]):
print(string, ": is a Palindrome String")
else:
print(string, ": is Not a Palindrome String")
8. Write a program to calculate Simple and compound interest.
p=float(input("Enter the principal amount : "))
r=float(input("Enter the rate of interest : "))
t=float(input("Enter the time in years : "))
SI=(p*t*r)/100
x=(1+r/100)**t
CI= p*x-p
print("Simple interest is : ", round(SI,2))
print("Compound interest is : ", round(CI,2))

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9. Write a program to input a character and to print whether a given character
is an alphabet, digit or any other character.
SOURCE CODE:
ch=input("Enter a character: ")
if ch.isalpha():
print(ch, "is an alphabet")
elif ch.isdigit():
print(ch, "is a digit")
elif ch.isalnum():
print(ch, "is alphabet and numeric")
else:
print(ch, "is a special symbol")
10.Program to count frequency of a given element in a list of numbers
SOURCE CODE:
Lst=eval(input ( " Enter list :"))
length=len(Lst)
element=int(input( " Enter element :"))
count=0
for i in range(0, length):
if element==Lst [i]:
count += 1
if count == 0:
print (element, "not found in given list")
else:
print(element, "has frequency as", count, "in given list")

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11.Program to create a dictionary containing names of competition winner
students as key number of their wins as values
SOURCE CODE:
n=int(input("How many students? "))
winners ={ }
for a in range(n):
key=input("Name of the student : ")
value=int(input ("Number of competitions won : "))
winners [key]=value
print ("The dictionary now is : ")
print (winners)
12.Write a program to calculate the factorial of an integer using recursion.
SOURCE CODE:
def factorial(n):
if n == 1:
return n
else:
return n*factorial(n-1)
num=int(input("enter the number: "))
if num < 0:
print("Sorry, factorial does not exist for negative numbers")
elif num == 0:
print("The factorial of 0 is 1")
else:
print("The factorial of ",num," is ", factorial(num))

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13.Write a program to print fibonacci series using recursion.
SOURCE CODE:
def fibonacci(n):
if n<=1:
return n
else:
return(fibonacci(n-1)+fibonacci(n-2))
num=int(input("How many terms you want to display: "))
for i in range(1,num+1):
print(fibonacci(i)," ", end=" ")
14.To write a Python program to find the maximum of a list of numbers.
n=int(input("Enter the list size:"))
a=[]
for i in range(n):
num=int(input("Enter the number"))
a.append(num)
print (a)
max=a[0]
for i in range(n):
if(max<a[i]):
max=a[i]
print ("maximum",max)

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15.Write a program for linear search.
SOURCE CODE:
L=int(input("Enter the list size:"))
a=[]
loc=-1
for i in range(L):
a.append(num)
print (a)
n=len(a)
item=eval(input("Enter the element that you want to search : "))
for i in range(n):
if a[i]==item:
loc=i+1
break
if loc > -1:
print("Element found at the position :", i+1)
else:
print("Element not Found")
16.Write a program for bubble sort.
SOURCE CODE:
L=int(input("Enter the list size:"))
a=[]
loc=-1

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for i in range(L):
a.append(num)
print (a)
n=len(a)
for p in range(0,n-1):
for i in range(0,n-1):
if a[i]>a[i+1]:
t=a[i]
a[i]=a[i+1]
a[i+1]=t
print("The sorted list is : ", a)
17.Program to input two numbers and print their LCM and HCF.
SOURCE CODE:
X=int(input("Enter first number:"))
Y= int (input("Enter second number:"))
if X >Y:
smaller = Y
else:
smaller = X
for i in range(1, smaller + 1):
if((X % i==0) and (Y % i == 0) ) :
hcf = i
lcm=(X* Y) / hcf
print("The H.C.F. of", X, "and ", Y, "is", hcf)
print("The L.C.M. of", X, "and ", Y, "is", lcm)

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18.Write a python function sin(x, n) to calculate the value of sin(x) using its
taylor series expansion up to n terms.
SOURCE CODE:
import math
def fact(k):
if k<=1:
return 1
else:
return k*fact(k-1)
step=int(input("How many terms : "))
x=int(input("Enter the value of x :"))
sum=0
for i in range(step+1):
sum+=(math.pow(-1,i)*math.pow(x,2*i+1))/fact(2*i+1)
print("The result of sin",'(', x, ')', "is :", sum)
19.Write a program to display ASCII code of a character and vice versa.
SOURCE CODE:
var=True
while var:
choice=int(input("Press-1 to find the ordinal value of a character
nPress-2 to find a character of a valuen"))
if choice==1:
ch=input("Enter a character : ")
print(ord(ch))
elif choice==2:
val=int(input("Enter an integer value: "))
print(chr(val))
else:
print("You entered wrong choice")
print("Do you want to continue? Y/N")
option=input()
if option=='y' or option=='Y':
var=True
else:
var=False

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SQL Program
SQL PROGRAMS
PART-B
Exp A: CREATE A STUDENT DATABASE AND COMPUTE THE RESULT.
1) Create a student database and compute the result.
Query 1:
 Create table student(stud_id number(4), stud_name varchar2(20),
Computer number(3), Maths number(3), Physics number(3), Chem
number(3));
2) Add record into the table for 5 students, using insert command.
Query 2:
 insert into student values('101','arun','69','70','55','90');
 insert into student values('102','Sunny','39','50','58','67');
 insert into student values('103','Prajwal','67','40','59','89');
 insert into student values('104','Satish','20','30','56','45');
 insert into student values('105','Rekha','19','70','89','40');
3) Display the description of the fields in table using desc command.
Query3:
 desc table student;
 desc student;
4) Display all records form the Student table using select command:
Query4:
 Select * from student;
5) Add to new fields to the table :
*total number(3)
FIELD NAME DATA TYPE
StudentID Number(4)
Studentname Varchar(20)
Computer Number(3)
Maths Number(3)
Physics Number(3)
Chem Number(3)

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Query5:
 Alter table student add (total number (3));
6) Calculate total Marks.
Query6:
 Update student set total=Comp+Maths+Physics+Chem;
7) Find the min, max, sum, and average of the marks in a student marks table.
Query7:
 SELECT min(total) FROM student;
 SELECT max(total) FROM student;
 SELECT sum(total) FROM student;
 SELECT avg(total) FROM student;
8) Add to new fields to the table:
*percentage number(3)
*result varchar2(10)
Query8:
 Alter table student add (percentage number (3), result varchar2(10));
(9) Calculate Percentage Marks.
Query9:
 Update student set percentage=total/4 where studentid>0;
10)Compute the result as "pass" or "fail" by checking if the student has scored
more than 35 marks in each subject.
Query10(a):
 Update student set result='pass' where Comp>=35 and Maths>=35 and
Physics>=35 and Chem>=35;
Query 10(b):
 Update student set result='fail' where Comp<35 or Maths<35 or
Physics<35 or Chem<35;
11)Retrieve all the records of the table.
Query 11:
 Select * from student;
12) Retrieve only student_id and student_name of all the students.
Query 12:

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 select student_id, student_name from student;
13) List the students who have the result as "pass".
Query 13:
 select * from student where result='pass';
14)List the students who have the result as "fail".
Query 14:
 select * from student where result='fail';
15)Count the number of students who have passed and failed.
 Query 15(a): select count (*) from student where result='pass';
 Query 15(b): select count (*) from student where result='fail';
Exp B: CONSIDER THE FOLOWING TABLE GAMES COMPUTE THE RESULT:
Table: GAMES
GCODE GAMENAME Type NUMBER PRIZE SCHEDULE
101 CaromBoard Indoor 2 5000 23-Jan-2019
102 Badminton Outdoor 2 12000 12-Dec-2019
103 TableTennis Indoor 4 8000 14-Feb-2019
104 Chess Indoor 2 9000 01-Sep-2019
105 Cricket Outdoor 4 25000 19-Mar-2019
Write SQL commands for the flowing statements:
1) Create a game database and compute the result.
Query 1:
 Create table games(gcode number(4), g_name varchar2(20), type
varchar2(10),gnumber number(3), gprize number(10), schedule date);
2) Add record into the table games.
Query 2:
insert into game values(101,' CaromBoard',' Indoor ',2, 5000,'23-Jan-2019');
insert into game values(102,' Badminton ',' Outdoor ',2, 12000, '12-Dec-2019');
insert into game values(103,' TableTennis ',' Indoor ',4, 8000,'14-Feb-2019');
insert into game values(104,' Chess ',' Indoor ',2, 9000,'01-Sep-2019');
insert into game values(105,' Cricket ',' Outdoor ',4, 25000, '19-Mar-2019');

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3) To display the name of all GAMES with their GCodes.
Query 3: select gcodes, gamename from games;
4) To display details of those GAMES which are scheduled between 02-Mar-
2014 and 10-Dec-2019.
Query 4: select * from games where scheduledate between ‘02-mar-2019'
and '10-dec-2019';
5) To display the content of the GAMES table in ascending order of Schedule
Date.
Query 5: select * from games order by scheduledate;
6)To display sum of Prize Money for each Type of GAMES.
Query 6: select sum(prizemoney) from games order by type;
(B) Give the output of the following SQL queries:
1) select count(distinct number) from games;
OUTPUT 1:
count(distinct number)
----------------------------------
2
2) SELECT MAX(ScheduleDate),MIN(ScheduleDate) FROM GAMES;
OUTPUT 2:
max(scheduledate) min(scheduledate)
---------------------------- --------------------------------
23-jan-2016 12-dec-2019

Xi CBSE Computer Science lab programs

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