Time Design
Problem Statement:
The problem is to calculate and display a new time of day given as input a current time and a wait time.
Specifically each input will be entered as two integer values representing hours and minutes. Time is expected to
be in 24 hour notation.
To solve this problem an internal representation for time must be chosen. My design will keep the hours and minutes
in integer variables with constraints on the possible integers allowed. For 24 hour notation this means that the
hour portion must always be between 1 and 24 inclusive. and the minutes portion must always be between 0 and 59
inclusive. My design will also output to the user an indicator if the new time occurs on a different day than the
current time (i.e. the new time is greater than 24:00). Another possible option would be to convert the input times
into minute only representations. In this case 1 = 00:01 (1 minute past midnight), 720 = 12:00 (noon) and 1440 = 24:
00 (midnight).
Variable Names and Types for Input:
Along with the list of variable required you should state any constraints that you choose to imposed on the input
values.
int curr_hours // hour portion of current time in 24 hour notation,
// valid values range from 1 - 24, where 12 represents noon and 24 represents midnight
int curr_mins // minute portion of current time, valid values range from 0 - 59
int wait_hours // number of hours to be added to current time, valid values limit is size of integer
int wait_mins // number of minutes to be added to current time, valid values range from 0 - 59
Procedural Abstraction:
INPUT DATA:
Since the values from the user are to be constrained to proper hour and minute values a function will be implemented
to ensure that the user enters only valid information for the current time and the wait time. Since the edits checks
for these to inputs are different there will be two different input functions.
//----------------------------------------------------------------
// getCurrentTime
//
// pre-condition:
// none
// post-condition:
// hours must be entered as a value between 1 and 24 inclusive
// minutes must be entered as a value between 0 and 59 inclusive
// the current time will be returned to calling function in an
// minute only representation
//----------------------------------------------------------------
int getCurrentTime( );
//----------------------------------------------------------------
// getWaitTime
//
// pre-condition:
// formal parameter are passed by value
// post-condition:
// hours will contain a positive value
// minutes will contain a value between 0 and 59 inclusive
// the wait time will be returned to calling function in an
// minute only representation
//----------------------------------------------------------------
int getWaitTime( );
CALCULATIONS:
There are two situations to consider given the representation identified above. The first is that adding minutes
may result in the case that the hours portion needs to be incremented by 1. This happens only if the sum of the
current minutes plus the wait minutes is greater than 59. The second issue is that adding hours may result in the
