Find the errors in the following code:

1. // Warning! This code contains ERRORS! if (x == 1);

y = 2; else if (x == 2);

y = 3; else if (x == 3);

y = 4;

2. // if (average = 100)

Warning! This code contains an ERROR!

System.out.println("Perfect Average!");

3. // if (num2 == 0)

Warning! This code contains ERRORS!

System.out.println("Division by zero is not possible."); System.out.println("Please run the program again "); System.out.println("and enter a number besides zero.");

else Quotient = num1 / num2; System.out.print("The quotient of " + Num1); System.out.print(" divided by " + Num2 + " is "); System.out.println(Quotient);

Review Questions and Exercises 181

182 Chapter 3

Decision Structures

4.

// Warning! This code contains ERRORS! switch (score) {

case (score > 90):

grade = 'A';

break;

case(score > 80):

grade = 'b';

break;

case(score > 70):

grade = 'C';

break;

case (score > 60):

grade = 'D';

break;

default: grade = 'F';

}

5. 6. 7. 8. 9.

10.

The following statement should determine whether x is not greater than 20.

What is wrong with it? if (!x > 20)

The following statement should determine whether count is within the range of 0 through 100.

What is wrong with it?

if (count >= 0 || count <= 100)

The following statement should determine whether count is outside the range of 0 through 100.

What is wrong with it? if (count < 0 && count > 100)

The following statement should assign 0 to z if a is less than 10; otherwise, it should assign 7 to z.

What is wrong with it?

z = (a < 10) : 0 ? 7;

Assume that partNumber references a String object. The following if statement should

perform a case-insensitive comparison. What is wrong with it?

if (partNumber.equals("BQ789W4")) available = true;

What is wrong with the following code?

double value = 12345.678;

System.out.printf("%.2d", value);