Question

Write a Python program stored in a file q3.py that:

• Gets single-digit numbers from the user on one line (digits are separated by white space) and adds them to a list. The first digit and the last digit should not be a zero. If the user provides an invalid entry, the program should prompt for a new value.

• Converts every entry in the list to an integer and prints the list. The digits in the list represent a non-negative integer. For example, if the list is [4,5,9,1], the entries represent the integer 4591. The most significant digit is at the zeroth index of the list.

• Adds the integer that the reversed value of the integer. For example, if the list is [4,5,9,1], the addition will be 4591 + 1954 = 6545 and the resulting list will be [6,5,4,5]

Sample Output#1:

1. **************************************************

2. Enter single digits separated by one space: 0 5 1 1

3. Invalid list, try again.

4. Enter single digits separated by one space: 8 5 9 0

5. Invalid list, try again.

6. Enter single digits separated by one space: 0 58 1 14

7. Invalid list, try again.

8. Enter single digits separated by one space: 4 5 9 1

9. The initial list is: [4,5,9,1]

10. The reversed list is: [1,9,5,4]

11. The addition list is: [6,5,4,5]

12. **************************************************

Answer 1

Solution:

Look at the code and comments for better understanding........

Screenshot of the code:

Output:

Code to copy:

while True:
        print("Enter single digits separated by one space: ",end="")
        L = input().split()
        m_digit = False
        #convert the string digits into numbers and check for multi digit numbers
        for i in range(len(L)):
                L[i] = int(L[i])
                if L[i] > 9:
                        m_digit = True
        #if zero is present at begining or end or multidigit number is present
        if L[0]==0 or L[-1]==0 or m_digit:
                print("Invalid list, try again.")
                continue
        #reversing the list L
        rev_L = L[::-1]
        #calculating numbers from the lists
        N,rev_N = 0,0
        for i in range(len(L)):
                N = N*10 + L[i] 
                rev_N = rev_N*10 + rev_L[i]
                #calculating the sum
        SUM = N + rev_N
        #converting the SUM to a list
        SUM_L = []
        while SUM!=0:
                rem = SUM % 10
                SUM_L = [rem] + SUM_L
                SUM//=10
        #printing the results
        print("The initial list is:",L)
        print("The reversed list is:",rev_L)
        print("The addition list is:",SUM_L)
        break

I hope this would help...........................:-))