Reference no: EM132272750

Design and implement a C program which repeatedly asks for a telephone number and validates it

The program exits when the user enters a negative integer for the telephone number. You can assume that the user always enters an integer for a telephone number.

Valid telephone numbers have 11 or 10 digits and follow the format.

Format: Trunk Code - Area Code or Mobile Code - Phone Number

1 + 3 or 2 + 7 = 11 or 10 digits  

• Trunk Code: 0
• Area Code: 200-299 (from 200 to 299 inclusive) which has 3 digits
• Mobile Code: 32-39, 52, 56, 58, 59, 70, 76-79, 81-99 which has 2 digits
• Phone Number: 7 digits

If the entered telephone number is valid, print out a message saying that it's valid. In the case it's not valid, print out a message saying that it's invalid and describes the error in details. Here is the list of errors:

• More than 11 digits
• Less than 10 digits
• Invalid trunk code
• Invalid area code
• Invalid mobile code