sa 11 ip chapter 6

1. Write a program that prompts for a phone number of 10 digits and two dashes, with dashes after the area code and the next three numbers. For example, 017-555-1212 is a legal input. Display if the phone number entered is valid format or not and display if the phone number is valid and not (i.e., contains just the digits and dash at specific places.

sa 11 cs chapter 9, sa 11 ip chapter 6 / PythonCSIP CS IP

# Code p = input(‘Enter Phone Number : ‘) val = False # length must be 12 if len(p) == 12 and p[3] == ‘-‘ and p[7] == ‘-‘: if (p[:3]+p[4:7]+p[8:]).isdigit(): # all the characters except dashes should be digits val = True if val: print(p, ‘is valid’) else: print(p, ‘is invalid’)

1. Write a program that prompts for a phone number of 10 digits and two dashes, with dashes after the area code and the next three numbers. For example, 017-555-1212 is a legal input. Display if the phone number entered is valid format or not and display if the phone number is valid and not (i.e., contains just the digits and dash at specific places. Read More »

12. If any recursive function can be easily written using iterative code, then what is the need for recursion ? When would you prefer recursion over iteration and vice versa ?