Assignment 4 PIP

Department of Computer Science & Engineering
Faculty of Engineering & Technology

1. Consider the following Python code intended to compute the sum of n natural numbers. During testing, it
was found that sum printed by program always excludes the last number. Debug the following script using
the debugger.
Program to compute the sum of n natural numbers.
Step by Step Debugging:

Python 3.10.12 (main, Jun 11 2023, 05:26:28) [GCC 11.4.0] on linux
Type "help", "copyright", "credits" or "license()" for more information.
========== RESTART: /media/vivek/Vivek/3rd Year/PIP/Assignment 4/Q1.py =========
> /media/vivek/Vivek/3rd Year/PIP/Assignment 4/Q1.py(4)<module>()
-> def summation(n):
(Pdb) s
-> def main():
(Pdb) s
-> if __name__ == '__main__':
(Pdb) s
-> main()
(Pdb) s
--Call--
> /media/vivek/Vivek/3rd Year/PIP/Assignment 4/Q1.py(10)main()
-> def main():
(Pdb) s
-> n = int(input("Enter number of terms: "))
(Pdb) n
Enter number of terms: 5
-> total = summation(n)
(Pdb) s
--Call--
> /media/vivek/Vivek/3rd Year/PIP/Assignment 4/Q1.py(4)summation()
-> def summation(n):
(Pdb) s
-> total = 0
(Pdb) s
-> for count in range(1, n):
(Pdb) s
-> total += count
(Pdb) s
(Pdb) p total
1
(Pdb) s
Name: Vivek Kumar Mohanta Regd. Number. : 2141013166

-> total += count
(Pdb) s
(Pdb) p total
3
(Pdb) s
-> total += count
(Pdb) s
(Pdb) p total
6
(Pdb) s
-> total += count
(Pdb) s
(Pdb) p total
10
(Pdb) s
-> return total
(Pdb) s
--Return--
> /media/vivek/Vivek/3rd Year/PIP/Assignment 4/Q1.py(8)summation()->10
-> return total
(Pdb) q
Traceback (most recent call last):
File "/usr/lib/python3.10/idlelib/run.py", line 578, in runcode
exec(code, self.locals)
File "/media/vivek/Vivek/3rd Year/PIP/Assignment 4/Q1.py", line 16, in <module>
main()
File "/media/vivek/Vivek/3rd Year/PIP/Assignment 4/Q1.py", line 12, in main
total = summation(n)
File "/media/vivek/Vivek/3rd Year/PIP/Assignment 4/Q1.py", line 8, in summation
return total
File "/usr/lib/python3.10/bdb.py", line 94, in trace_dispatch
return self.dispatch_return(frame, arg)
File "/usr/lib/python3.10/bdb.py", line 156, in dispatch_return
if self.quitting: raise BdbQuit
bdb.BdbQuit

Previous Code Corrected Code

import pdb import pdb
pdb.set_trace() pdb.set_trace()
def summation(n): def summation(n):

total = 0 total = 0
for count in range(1, n): for count in range(1, n + 1):
total += count total += count
return total return total
def main(): def main():

n = int(input("Enter number of terms: n = int(input("Enter number of terms:
")) "))
total = summation(n) total = summation(n)
print("Sum of first",n,"positive print("Sum of first",n,"positive
integers: ",total) integers: ",total)
if __name__ == '__main__': if __name__ == '__main__':

main() main()
2. Consider the following Python code intended to print inverse right triangle for given numbers of rows
nRows. For example, for nRows = 5, the following inverted triangle should be printed:
*****
****
***
**
*
During testing, it was found that the program does not produce even the single line of output. Debug
the following script using the debugger.
Program to print inverse right triangle.
-> def invertedRightTriangle(nRows):
(Pdb) s
-> def main():
(Pdb) s
-> if __name__ == '__main__':
(Pdb) s
-> main()
(Pdb) s

--Call--
-> def main():
(Pdb) n
Enter number of rows: 5
-> invertedRightTriangle(nRows)
(Pdb) s
--Call--
> /media/vivek/Vivek/3rd Year/PIP/Assignment 4/Q2.py(3)invertedRightTriangle()
-> def invertedRightTriangle(nRows):
(Pdb) s
> /media/vivek/Vivek/3rd Year/PIP/Assignment 4/Q2.py(4)invertedRightTriangle()
-> for i in range(nRows, 0):
(Pdb) s
--Return--
> /media/vivek/Vivek/3rd Year/PIP/Assignment 4/Q2.py(4)invertedRightTriangle()->None
-> for i in range(nRows, 0):
(Pdb) q
main()
invertedRightTriangle(nRows)
File "/media/vivek/Vivek/3rd Year/PIP/Assignment 4/Q2.py", line 4, in
invertedRightTriangle
for i in range(nRows, 0):
bdb.BdbQuit

def invertedRightTriangle(nRows): def invertedRightTriangle(nRows):
for i in range(nRows, 0): for i in range(nRows, 0, -1):
print("*"*i); print("*"*i);

nRows = int(input("Enter number of nRows = int(input("Enter number of
rows: ")) rows: "))
invertedRightTriangle(nRows) invertedRightTriangle(nRows)

main() main()

3. Consider the Python script given below intended to compute the percentage. During testing, it was
found that percentage computed was not accurate rather rounded to lower bound integer value. Debug
the following script using the debugger.
Program to print inverse right triangle
-> def main():
(Pdb) s
-> if __name__ == '__main__':
(Pdb) s
-> main()
(Pdb) s
--Call--
-> def main():
(Pdb) s
-> totalMarks = 0
(Pdb) s
-> i = 0
(Pdb) s
-> while True:
(Pdb) s
-> marks = input("Enter marks for subject "+str(i+1)+":")
(Pdb) n
Enter marks for subject 1:75
-> if marks=='':
(Pdb) s
-> marks = int(marks)
(Pdb) s
-> if marks<0 or marks>100:
(Pdb) s
-> i += 1
(Pdb) s
-> totalMarks += marks
(Pdb) s


(Pdb) n
Enter marks for subject 2:80
-> if marks=='':
(Pdb) s
-> marks = int(marks)
(Pdb) s
-> if marks<0 or marks>100:
(Pdb) s
-> i += 1
(Pdb) s
-> totalMarks += marks
(Pdb) s
-> while True:
(Pdb) s
(Pdb) n
Enter marks for subject 3:
-> if marks=='':
(Pdb)
-> break
(Pdb) s
-> percentage = totalMarks // i
(Pdb) s
-> print("Total Marks: ",int(totalMarks))
(Pdb) s
--Call--
> /usr/lib/python3.10/idlelib/run.py(462)write()
-> def write(self, s):
(Pdb) u
-> print("Total Marks: ",int(totalMarks))
(Pdb) n
Total Marks: 155
-> print("Percentage: ",round(percentage, 2))
(Pdb) n
Percentage: 77
--Return--

> /media/vivek/Vivek/3rd Year/PIP/Assignment 4/Q3.py(18)main()->None

-> print("Percentage: ",round(percentage, 2))
(Pdb) q
main()
print("Percentage: ",round(percentage, 2))
bdb.BdbQuit

totalMarks = 0 totalMarks = 0
i = 0 i = 0
while True: while True:
marks = input("Enter marks for marks = input("Enter marks for
subject "+str(i+1)+":") subject "+str(i+1)+":")
if marks=='': if marks=='':
break break
marks = int(marks) marks = int(marks)
if marks<0 or marks>100: if marks<0 or marks>100:
print("Invalid Marks") print("Invalid Marks")
continue continue
i += 1 i += 1
totalMarks += marks totalMarks += marks
percentage = totalMarks // i percentage = totalMarks / i
print("Total Marks: print("Total Marks:
",int(totalMarks)) ",int(totalMarks))
print("Percentage: print("Percentage:
",round(percentage, 2)) ",round(percentage, 2))

main() main()
4. Consider the Python given below intended to determine whether the given year is a leap year. During
testing, it was found that an year such as 1800 or 2100, despite being non-leap year, was also displayed
as a leap-year. Debug the following script using the debugger.
Program to print Leap Year


-> def isLeapYear(year):
(Pdb) s
-> def main():
(Pdb) s
-> if __name__ == '__main__':
(Pdb) s
-> main()
(Pdb) s
--Call--
-> def main():
(Pdb) s
-> year = int(input("Enter Year "))
(Pdb) n
Enter Year 2100
-> print("It is a leap year: ", isLeapYear(year))
(Pdb) n
It is a leap year: True
--Return--
(Pdb) q
main()
print("It is a leap year: ", isLeapYear(year))
bdb.BdbQuit


-> def isLeapYear(year):
(Pdb) s
-> def main():
(Pdb) s
-> if __name__ == '__main__':
(Pdb) s
-> main()
(Pdb) s
--Call--
-> def main():
(Pdb) s
-> year = int(input("Enter Year "))
(Pdb) n
Enter Year 2100
(Pdb) n
It is a leap year: True
--Return--
(Pdb) q
main()
print("It is a leap year: ", isLeapYear(year))
bdb.BdbQuit


def isLeapYear(year): def isLeapYear(year):

return year%400==0 or year%100==0 or return year%400==0 and year%100==0 or
year%4==0 year%4==0

year = int(input("Enter Year ")) year = int(input("Enter Year "))
print("It is a leap year: ", print("It is a leap year: ",
isLeapYear(year)) isLeapYear(year))

main() main()
5. Consider the Python script given below intended to find HCF. During testing, it was found that program
yields an error for numbers having no common factor other than 1. Debug the following script
using the debugger.
Program to find HCF of two numbers

=================== RESTART: /home/vivek/Documents/PIP/Q4.py ===================
> /home/vivek/Documents/PIP/Q4.py(4)<module>()
-> def findHCF(num1, num2):
(Pdb) s
-> def main():
(Pdb) s
-> if __name__ == '__main__':
(Pdb) s
-> main()
(Pdb) s
--Call--
> /home/vivek/Documents/PIP/Q4.py(14)main()
-> def main():
(Pdb) s
-> num1 = int(input("Enter first number: "))
(Pdb) n
Enter first number: 5

-> num2 = int(input("Enter second number: "))
(Pdb) n
Enter second number: 13
-> print(findHCF(num1,num2))
(Pdb) n
UnboundLocalError: local variable 'HCF' referenced before assignment
-> print(findHCF(num1,num2))
(Pdb) q
File "/home/vivek/Documents/PIP/Q4.py", line 20, in <module>
main()
File "/home/vivek/Documents/PIP/Q4.py", line 17, in main
print(findHCF(num1,num2))
return self.dispatch_exception(frame, arg)
File "/usr/lib/python3.10/bdb.py", line 176, in dispatch_exception
bdb.BdbQuit

def findHCF(num1, num2): def findHCF(num1, num2):

if num1<num2: if num1<num2:
minNum = num1 minNum = num1
else: else:
minNum = num2 minNum = num2
for i in range (minNum, 1, -1): for i in range (1, minNum + 1):
if num1%i == 0 and num2%i == 0: if num1%i == 0 and num2%i == 0:
HCF = i HCF = i
return HCF return HCF

num1 = int(input("Enter first number: num1 = int(input("Enter first number:
")) "))
num2 = int(input("Enter second num2 = int(input("Enter second
number: ")) number: "))
print(findHCF(num1,num2)) print(findHCF(num1,num2))

main() main()

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Department of Computer Science & Engineering

Faculty of Engineering & Technology

Step by Step Debugging:

Name: Vivek Kumar Mohanta Regd. Number. : 2141013166

Name: Vivek Kumar Mohanta Regd. Number. : 2141013166

Previous Code Corrected Code

def summation(n): def summation(n):

def main(): def main():

if __name__ == '__main__': if __name__ == '__main__':

Name: Vivek Kumar Mohanta Regd. Number. : 2141013166

Previous Code Corrected Code

def main(): def main():

if __name__ == '__main__': if __name__ == '__main__':

Name: Vivek Kumar Mohanta Regd. Number. : 2141013166

Name: Vivek Kumar Mohanta Regd. Number. : 2141013166

> /media/vivek/Vivek/3rd Year/PIP/Assignment 4/Q3.py(7)main()

Name: Vivek Kumar Mohanta Regd. Number. : 2141013166

> /media/vivek/Vivek/3rd Year/PIP/Assignment 4/Q3.py(18)main()->None

Previous Code Corrected Code

if __name__ == '__main__': if __name__ == '__main__':

Name: Vivek Kumar Mohanta Regd. Number. : 2141013166

Step by Step Debugging:

Name: Vivek Kumar Mohanta Regd. Number. : 2141013166

Python 3.10.12 (main, Jun 11 2023, 05:26:28) [GCC 11.4.0] on linux

Name: Vivek Kumar Mohanta Regd. Number. : 2141013166

Previous Code Corrected Code

def isLeapYear(year): def isLeapYear(year):

def main(): def main():

if __name__ == '__main__': if __name__ == '__main__':

Step by Step Debugging:

Name: Vivek Kumar Mohanta Regd. Number. : 2141013166

Previous Code Corrected Code

def findHCF(num1, num2): def findHCF(num1, num2):

def main(): def main():

if __name__ == '__main__': if __name__ == '__main__':

Name: Vivek Kumar Mohanta Regd. Number. : 2141013166

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