PRACTICE SET
1) Given a string S(input consisting) of ‘*’ and ‘#’.
The length of the string is variable.
The task is to find the minimum number of ‘*’ or ‘#’ to make it a valid string.
The string is considered valid if the number of ‘*’ and ‘#’ are equal.
The ‘*’ and ‘#’ can be at any position in the string.
Note : The output will be a positive or negative integer based on number of ‘*’ and ‘#’ in
the input string.
• (*>#): positive integer
• (#>*): negative integer
• (#=*): 0
Code:
s=input("Enter a string : ")
a=0
b=0
for i in s:
if i=='*':
a+=1
elif i=='#':
b+=1
print(a-b)
2) In a given string data,
separate the integer values and string values.
What is the sum of integer values from the given string.
Code:
s = input("Enter data : ")
num_res = []
text_res =[]
for i in s:
if(i.isdigit()):
num_res.append(int(i))
else:
text_res.append(i)
print(num_res)
print(sum(num_res))
print(text_res)
3) In a given list of numbers as input,
find the difference between the sum of odd and even position digits.
Code:
num = [int(d) for d in input("Enter the number:")]
even,odd = 0,0
for i in range(0,len(num)):
if i % 2 ==0:
even = even + num[i]
else:
odd = odd + num[i]
print(abs(odd-even))
4) Check whether given string is a plaindrome or not ?
s = input("Enter a number:")
rev = s[::-1]
if s == rev:
print("Palindrome")
else:
print("Not palindrome")
5) Check whether given number is a plaindrome or not ?
num=int(input("Enter a number:"))
temp=num
rev=0
while(num>0):
dig=num%10 # eg 121 ->121%10 ->1
rev=rev*10+dig # 0*10+1 -> 1
num=num//10 # 121//10 -> 12 ->12>0
if(temp==rev):
print("The number is palindrome!")
else:
print("Not a palindrome!")
6) Write a to Half pyramid pattern printing from 1 to number of rows given
rows = int(input("Enter number of rows : "))
for i in range(1, rows + 1):
for j in range(1, i + 1):
print(j, end=' ')
print('')
7) Write a program to print Prime number from 1 to 100 ?
a=1
b = 100
for n in range(a, b + 1):
if n > 1:
for i in range(2, n):
if (n % i) == 0:
break
else:
print(n)
8) Write a program to print Half Pyramid with '*'?
rows = 5
for i in range(0, rows):
# nested loop for each column
for j in range(0, i + 1):
# print star
print("*", end=' ')
# new line after each row
print("\r")
9) Write a program to print inverted half pyramid with '*'?
rows = 5
for i in range(rows + 1, 0, -1):
# nested reverse loop
for j in range(0, i - 1):
# display star
print("*", end=' ')
print(" ")
10) Write a program to print A to Z based on their ASCII code ?
ascii_number = 65
rows = 7
for i in range(0, rows):
for j in range(0, i + 1):
character = chr(ascii_number)
print(character, end=' ')
ascii_number += 1
print(" ")
11) Write a program to add number until zero is given.
number = int(input('Enter a number: '))
total = 0
while number != 0:
total += number
number = int(input('Enter a number: '))
print('total =', total)
12) Write a program to find factorial using while loop.
num = int(input("Enter a number: "))
factorial = 1
i=1
if num > 0:
while i <= num:
factorial = factorial * i
i=i+1
print("Factorial of ", num, " is ", factorial)
13) Write a program to print only consonants from the given string.
i=0
a = input("Enter Data : ")
while i < len(a):
if a[i] == 'a' or a[i] == 'e' or a[i] == 'i' or a[i] == 'o' or a[i] == 'u':
i += 1
continue
print('Current Letter :', a[i])
i += 1
14) write a program to find given number is Armstrong number or not?
num = int(input("Enter number : "))
res = 0
temp = num
if num>9:
while temp>0:
digit = temp%10
cube = digit**3
res = res+cube
temp = temp//10
if res == num:
print("Armstrong number")
else:
print("Not Armstrong")
else:
print("Value has to be greater than 9")
15) Write a program to delete the values which are greater than 60 from the given data.
number_list = [10,80,90, 20,50,60, 30, 40, 100]
i=0
# get list's size
n = len(number_list)
# iterate list till i is smaller than n
while i < n:
# check if number is greater than 50
if number_list[i] > 60:
# delete current index from list
del number_list[i]
# reduce the list size
n=n-1
else:
# move to next item
i=i+1
number_list.sort()
print(number_list)
