CSCI 3300
Spring 2009
Exercises for Quiz 1

1. What is the value of C++ expression 5 * 4 - 6 * 3 - 9?

   1. -7
   2. -19
   3. 1
   4. 11
   5. 33
   Answer

2. What is the value of C++ expression 9/4 + 1?

   1. 1.25
   2. 2
   3. 2.25
   4. 3
   5. 3.25
   Answer

3. Function g is defined below. What is the value of expression g(3)?

   1. 0
   2. 6
   3. 9
   4. 3
   5. 12

  int g(int n)
  {
    if(n > 3) return 0;
    else return 2*n+3;
  }

Answer

4. Using function g from the preceding exercise, what is the value of expression g(g(3))? This previously had an incorrect answer.

   1. 0
   2. 9
   3. 18
   4. 21
   5. 25
   Answer

5. What is the value of variable r after the program fragment below is finished? Do a careful hand simulation.

   1. 3
   2. 4
   3. 5
   4. 8
   5. 16

         int n = 1;
         int r = 1;
         while(n < 5)
         {
           r = r + r;
           n = n + 1;
         }

   Answer

6. Suppose that variable y, of type double, already exists and has a value. Write a statement or sequence of statements that (1) creates a variable called frame of type double, and (2) makes frame hold value (y² - 7y + 4)/9. Be sure to use C++ notation correctly. The expression shown is not in C++ notation, but in standard mathematical notation. Answer

7. Suppose that variable u has type int, and has already been given a value. Write a statement or statements that create variable m, of type int, and make m hold the absolute value of u. For this exercise, do not use the C++ abs function, or any close relative of it. (The absolute value of 4 is 4, and the absolute value of -4 is 4.) Answer