2.24 LAB: Variables/Assignments: Phone number breakdown

Given an integer representing a 7-digit phone number, excluding the area code, output the prefix and line number, separated by a hyphen.

Ex: If the input is:

5551212 

the output is:

555-1212 

Hint: Use % to get the desired rightmost digits. Ex: The rightmost 2 digits of 572 is gotten by 572 % 100, which is 72.

Hint: Use / to shift right by the desired amount. Ex: Shifting 572 right by 2 digits is done by 572 / 100, which yields 5. (Recall integer division discards the fraction).

For simplicity, assume any part starts with a non-zero digit. So 011-9999 is not allowed.