Java Illuminated, 5th Edition

2.6 Exercises, Problems, and Projects

2.6.1 Multiple Choice Exercises

1. 1. What is the valid way to declare an integer variable named a? (Check all that apply.)

   • ❑ int a;

   • ❑ a int ;

   • ❑ integer a;

2.   2. Which of the following identifiers are valid?

   • ❑ a

   • ❑ sales

   • ❑ sales&profit

   • ❑ int

   • ❑ inter

   • ❑ doubleSales

   • ❑ TAX_RATE

   • ❑ 1stLetterChar

   • ❑ char

3.   3. Given three declared and initialized int variables a, b, and c, which of the following statements are valid?

   • ❑ a = b;

   • ❑ a = 67;

   • ❑ b = 8.7;

   • ❑ a + b = 8;

   • ❑ a * b = 12;

   • ❑ c = a − b;

   • ❑ c = a / 2.3;

   • ❑ boolean t = a;

   • ❑ a /= 4;

   • ❑ a += c;

2.6.2 Reading and Understanding Code

4.   4. What is the output of this code sequence?

   double a = 12.5;
   System.out.println( a );

5.   5. What is the output of ...