CS 2620 Assignment #2 Summer 2004

How to handin.
Points : 30
Weight : 3%
Due : Monday May 17, 2004 @ 11:00 pmt
Note : Late assignments will be accepted only with the instructor's pre-approval.

1. [10] Structs
   Rewrite your point library from assignment 1 question 3 so that the point is implemented using a struct. Rewrite the test program so that is uses the new library.
2. [10] Pointers
   Explain how each of the following statements affects the heap and/or stack in memory. For each statement
   • if memory is allocated, you should tell whether it is allocated on the heap or the stack, what type of data may be stored there, and the value stored if known.
   • if memory is changed, you should indicate which memory is changed and its new value.
   You may assume that the statements follow each other in a program.
   1. int x = 5;
   2. int* xPtr = &x;
   3. float* iPtr = new float;
   4. float* jPtr = new float(10.0);
   5. float* kPtr = new float[10];
   6. int k[ ] = { 6, 3, 1, 5, 2 };
   7. int& y = x;
   8. x = *k+3;
   9. x = *(k+3);
   10. y = 16;

3. [5] Constants and Pointers
   Given the following declarations and initializations :
   • int i = -1;
   • const int ic = i;
   • const int* pic = ⁣
   • int* const cpi = &i;
   • const int* const cpic = ⁣
   Which of the following assignments are legal? Explain why.
   1. pic = ⁣
   2. cpi = pic;
   3. pic = cpic;
   4. cpic = ⁣
   5. ic = *cpic;

4. [5] Using the ctime library.
   
   1. Create a mytime library with the following functions:
      • printToday() - prints todays date as dd/mm/yyyy
      • printNow() - prints the current time as hh:mm:ss
      • delay(n) - waits n seconds before continuing with execution.
   2. Write a test program which prints the current date and time and then waits 10 seconds and then prints the current time.

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