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h03
CS16 W19
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h03: Chapter 3: Boolean expressions, multiway branches, more loops

ready? assigned due points
true Thu 01/24 09:00AM Mon 01/28 11:00PM

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Read Ch 3.1 - 3.3, pages 112-118, 120-154.

    1. (12 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 parentheses to show how the expression is evaluated according to the C++ precedence rules. See the first line for an example. 
         x + 2 || !y - 3    ->   (x + 2) || ((-y) - 3)

  a) x == 2 || y > 20

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

  c) x + 7 > 10 || x + 23 < -7
    2. (10 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. (10 pts) What is the outcome of the following code? 
    
int x = 0;
while ( x = 2 && x <10) {
   cout << x << endl;
   x+=2;
 }
    5. (18 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. Write T or F in the provided space. 
      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. (30 pts) Using plain and/or multiway if-else statements ONLY write a program (just the main function, no header files) that outputs the grade of a student given an integer variable 'score'. The program should read the student's score as a argument passed to main(). 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. Write the code for a functionally correct program below.

    7. (10 pts) What is the output of the following statements? 
    int p = 5;
while (--p > 0)
     cout << p << " ";
    8. (10 pts) What is the output of the following statements? 
    int s = 1;
do
     cout << s << " ";
while (s++ <= 5);