1
h04
CS16 W18
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h04: Chapter 3: Boolean expressions, multiway branches, more loops

ready? assigned due points
true Tue 01/30 09:00AM Tue 02/06 08:00PM

You may collaborate on this homework with AT MOST one person, an optional "homework buddy".

MAY ONLY BE TURNED IN IN THE LECTURE/LAB LISTED ABOVE AS THE DUE DATE,
OR IF APPLICABLE, SUBMITTED ON GRADESCOPE. There is NO MAKEUP for missed assignments;
in place of that, we drop the three lowest scores (if you have zeros, those are the three lowest scores.)

Please:

  • No Staples.
  • No Paperclips.
  • No folded down corners.

Read Ch 3.1 -3.3, pages 112-118,120 -154 (If you do not have a copy of the textbook yet, there is one on reserve at the library under “COMP000-STAFF - Permanent Reserve”).

PLEASE WRITE ALL YOUR ANSWERS IN THIS SHEET. HOMEWORKS SUBMITTED IN A FORMAT DIFFERENT FROM THE PROVIDED TEMPLATE WILL RECEIVE 0 POINTS. PLEASE MARK YOUR HOMEWORK CLEARLY, REGARDLESS OF IF YOU WRITE IT OUT IN INK OR PENCIL!

    1. (6 pts) Precedence rules determine how the compiler groups operators and operands when evaluating an expression in the absence of paranthesis. For each of the following expressions add paranthesis to show how the expression is evaluated according to the C++ precedence rules? 
      a) x == 2 || y > 20

  b) !y && x < 9 * 2 || y < x

  c) x + 7 > 10 || x + 23 < -7
    2. (2 pts) Show the output of the following code AND also write the final value of x after the code is executed. 
    int x = 17;
while ( x > 0) {
   cout << x << endl;
   x = x – 5;
 }
    3. (2 pts) What is the outcome of the following code? 
    int x = 0;
while ( x = 2 && x <10) {
   cout << x << endl;
   x+=2;
 }
    5. (6 pts) What is the result (i.e. TRUE or FALSE) of the following Boolean expressions in C++, given that: x = 2, y = -1, z = 0 in each case 
      a) (x == 6)
  b) !(y > 0)
  c) ((x == 2) || (y > 20))
  d) ((x >= 3) && (z <= 12))
  e) ((x > y) && (y < z))
  f) ((!(x < z) || (y > z)) && (z == 12) && (y == 10))
    6. (9 pts) Using plain and/or multiway if-else statements ONLY write a program that outputs the grade of a student given an integer variable 'score'. The program should read the student's score from standard input. If the score is outside the range of 0 and 100, the program should output "Not a valid score" and exit. Otherwise it should output the string "Grade is X" where X is replaced by the student's letter grade according to the following rubric: 
    90 <= score <=100, grade = 'A'| 80 <= score < 90 , grade = 'B'| 70 <= score < 80 , grade = 'C'|
60 <= score < 70 , grade = 'D' | 0 <= score < 60 , grade = 'F'

    …..a) Make your program easy to read and understand. Format your answers so that they are readable on the display. This means consider your use of “\n” characters.

    …..b) Test this program out by compiling it and running it the same way you do with lab assignments. When you are sure that you have a working program, write it out in the space provided below. You will be graded for programming style as well as having a functionally correct program.