1. CS 1430: Programming in C++
No time to cover HiC

2. Tracing Range Known Tracing Input: 48 54 66 53 59 -1
const int LOW_LIMIT = 0;
const int HIGH_LIMIT = 60;
int score, max = LOW_LIMIT;
cin >> score;
while (score != -1) {
if (score < LOW_LIMIT ||
score > HIGH_LIMIT)
cout << “Invalid score: ”
<< score;
else
if (score > max)
max = score; }
Tracing
Input:
score max ? 48 54 66 53 59 -1
How to do it?
One statement each line
Do not cross old values
Blank when no new value
WILL BE ON QUIZ
And Test 1
And Final!

3. Quiz3-2
10 Minutes

4. Write C++ Statements
// Decrease theCount by 2 until theCount is negative.
while ( theCount >= 0 ) {
theCount -= 2; }
// Another way
while ( !(theCount < 0) )
// Incorrect!
while ( theCount !< 0 )
while ( theCount > 0 )
Slides could be moved to an earlier note

5. Write C++ Statements
// While theValue is not positive, increase its value by 5.
while ( theValue <= 0 ) {
theValue += 5; }
// Another way
while ( !(theValue > 0) )
// Incorrect!
while ( theValue < 0 )

6. Write C++ Statements DeMorgan’s Law
// While theValue is not positive and theCount is
// less than 10, increase theValue by 5 and theCount by 1.
while ( theValue <= 0 && theCount < 10 ) {
theValue += 5;
theCount ++; }
// increase theValue by 5 and theCount by 1
// until theValue is positive or theCount is 10 or higher.
while ( !(theValue > 0 || theCount >= 10) )
// The same?
DeMorgan’s Law

7. Example
int someValue = 0; int i = 0; while (i < 10) { int j = 0; while (j < 5) someValue += i * j; // A j ++; } i ++; How many times is statement A executed? None of above 50

8. Example
int count = 0; int i = 0; while (i < 10) { int j = 5; while (j > 0) count ++; j --; } i ++; What is the final value of count? None of above 50

9. Example
int total = 0; int i = 5; while (i > 0) { int j = i; while (j > 0) total += j; j --; } i --; What is the final value of total? None of above 35

10. Tracing Nested Loops
int xValue, yValue, zValue; xValue = 3; while (xValue > 1) { zValue = 1; yValue = xValue; while (yValue > 0) zValue *= yValue; yValue --; } cout << "What is this: " << zValue; xValue --;
xValue yValue zValue
? ? ? 3 1 2 6

11. Schedule Quiz3-3 Lab3 Prog1 Due 10 pm today Due 5 pm Thursday
Past Due already
Grace Time: 10 pm Friday

12. Schedule Prog2 Test 1 Nested loops Started Tuesday, 9-22
Friday, October 2
60 points
If, While, and Others

13. Getting Help
Pals 9 – 3 pm, Thursdays Lab Assistants 6 – 9 pm, Mon - Thur Come to me for help Name your file: UserName_Lab/ProgX Drop your program in K:\Courses\CSSE\yangq\Dropbox

14. You can still receive 15 points on Prog1!