Prelab Tasks:

1. Write the declaration of the time24 class in a file named time24.h. You need to guard this file using #ifndef, #define, #endif. You also need to document each public member of the class.
   • Time24 -- specifies a time-of-day in hours and minutes.
   • Data members:
     • Hours (0-23)
     • Minutes (0-59)
   • Operations on the Time24 ADT:
     • constructor
     • readTime -- ask the user to enter a time-of-day in form of hours:minutes
     • writeTime(): print out the time-of-day in form of hours:minutes
     • duration( ) Measure the length of time from the current time to a time24 object passing through function and return the result as a time24 value
     • addTime -- add a specified number of minutes to a time-of-day and adjust the hours and minutes to fall in their specified range
     • getHour -- returns the hour. (accessing function)
     • getMinute -- returns the minute. (accessing function)
     • normalizeTime -- utility function sets the hour value in the range 0 to 23 and the minute value in the range 0 to 50
2. Write the definitions of the class members in the file time24.cpp.
3. Put your time24.h and time24.cpp in your Lab2 directory. Compile time24.cpp (just compile, don't link). Use g++ -c time24.cpp. Errors? Fix 'em. Successful compilation produces the object file time24.o

Lab Tasks

1. Declare the isLater() function in a guarded header file named time24Aux.h. Define it in a file named time24Aux.cpp. [Don't forget to guard the time24Aux header file]
   • isLater() function that takes two time24 objects and determine whether the first time is later than the second.
     • bool isLater (const time24 & t1, const time24& t2);
2. Write a program that declares a time24 object clock that is initially set to 9:00AM. In a loop, enter a sequence of minutes values. use each to increment time, and output the new value. Terminate the loop when clock exceeds 5:00PM, and output the final time.
   • Use the free function isLater() developed in the previous task.

   • Write your main function in a file named lab2TimeDriver.cp

   • Compile lab2TimeDriver.cpp and time24Aux.cpp. Use g++ -c time24Aux.cpp and g++ -c lab2TimeDriver.cpp At this point, you should have three object files, time24.o, time24Aux.o, and lab2TimeDriver.o

   • Link your object files to produce an executable named lab2TimeDriver.exe. Use g++ -o lab2TimeDriver.exe time24.o time24Aux.o lab2TimeDriver.o Execute your program by typing lab2TimeDriver. Compare your output with the sample output. Make sure it works correctly.