CSC60A: Outcome 2/ WQ

The code segment below is intended to calculate the circumference c of a circle with the diameter d of 1.5. The circumference of a circle is equal to its diameter timespi.

/* missing declarations */

c = pi * d;

Which of the following variable declarations are most appropriate to replace /* missing declarations */ in this code segment?

• int pi = 3.14159;

  int d = 1.5;

  final int c;

• final int pi = 3.14159;

  int d = 1.5;

  int c;

• final double pi = 3.14159;

  double d = 1.5;

  double c;

• double pi = 3.14159;

  double d = 1.5;

  final double c = 0.0;

• final double pi = 3.14159;

  final double d = 1.5;

  final double c = 0.0;

Consider the following code segment.

int x = 5;

int y = 6;

/* missing code */

z = (x + y) / 2;

Which of the following can be used to replace /* missing code */ so that the code segment will compile?

I. int z = 0;

II. int z;

III. boolean z = false;

• I only

• II only

• I and II only

• II and III only

• I, II and III

A code segment (not shown) is intended to determine the number of players whose average score in a game exceeds 0.5. A player’s average score is stored in avgScore, and the number of players who meet the criterion is stored in the variable count.

Which of the following pairs of declarations is most appropriate for the code segment described?

• double avgScore;

  boolean count;

• double avgScore;

  double count;

• double avgScore;

  int count;

• int avgScore;

  boolean count;

• int avgScore;

  int count;

What type should you use to represent the number of people in a household?

• int

• String

• Double

• Boolean

• Float

What type should you use to represent the first name of a person?

• int

• String

• Double

• Boolean

• Float

What type should you use to record if it is raining or not?

• int

• String

• Double

• Boolean

• Float

What type should you use for a shoe size like 8.5?

• int

• String

• Double

• Boolean

• Float

Which of the following pairs of declarations are the most appropriate to store a student’s average course grade in the variable GPA and the number of students in the variable numStudents?

• int GPA; int numStudents;

• double GPA; int numStudents;

• int GPA; double numStudents;

• double GPA; double numStudents;

• double GPA; boolean numStudents;