Chapter 4 Conditional Execution Test Review

What does the following code print when x has been set to 187?

if (x < 0)

{

System.out.println("x is negative");

}

else if (x == 0)

{

System.out.println("x is zero");

}

else

{

System.out.println("x is positive");

}

• x is negative

• x is zero

• x is positive

What is printed when the following code executes and x equals 4 and y equals 3?

if (!(x < 3 || y > 2))

System.out.println("first case");

else

System.out.println("second case");

• first case

• second case

What is the value of grade when the following code executes and score is 80?

if (score >= 90) grade = "A";

if (score >= 80) grade = "B";

if (score >= 70) grade = "C";

if (score >= 60) grade = "D";

else grade = "E";

• A

• B

• C

• D

• E

What is printed when the following code executes and x has been set to zero and y is set to 3?

if (x > 0 || (y / x) == 3)

System.out.println("first case");

else

System.out.println("second case");

• first case

• second case

• You will get a error because you can't divide by zero.

Which of the following expressions is equivalent to !(c || d)?

• (!c) && (!d)

• (c && d)

• !(c && d)

• (!c) || (!d)

Which of the following is equivalent to the code segment below?

if (x > 2)

x = x * 2;

if (x > 4)

x = 0;

• x = 0;

• if (x > 2) x *= 2;

• if (x > 2) x = 0;

• if (x > 2) x = 0; else x *= 2;

Which of the following is equivalent to the code segment below?

if (x > 0)

x = -x;

if (x < 0)

x = 0;

• x = 0;

• if (x > 0) x = 0;

• if (x > 0) x = -x; else x = 0;

• if (x < 0) x = 0; else x = -1;

At a certain high school students receive letter grades based on the following scale: 93 or above is an A, 84 to 92 is a B, 75 to 83 is a C, and below 75 is an F. Which of the following code segments will assign the correct string to grade for a given integer score?

I. if (score >= 93)

grade = "A";

if (score >= 84 && score <=92)

grade = "B";

if (score >=75 && score <= 83)

grade = "C";

if (score < 75)

grade = "F";

II. if (score >= 93)

grade = "A";

if (score >= 84)

grade = "B";

if (score >=75)

grade = "C";

if (score < 75)

grade = "F";

III. if (score >= 93)

grade = "A";

else if (score >= 84)

grade = "B";

else if (score >=75)

grade = "C";

else

grade = "F";

• I and III only

• II only

• III only

• I and II only

• I, II, and III

Susan is 5 years older than Matt. Three years from now Susan’s age will be twice Matt’s age. What should be in place of the following condition to solve this problem?

for (int s = 1; s <=100; s++) {

for (int m = 1; m <= 100; m++) {

if (condition)

System.out.println("Susan is " + s + " and Matt is " + m);

}

}

• s == (m - 5) && (2 * s + 3) == (m + 3)

• (s == m - 5) && (s - 3 == 2 * (m - 3))

• (s == (m + 5)) && ((s + 3) == (2 * m + 3))

• s == m + 5 && s + 3 == 2 * m + 6

• None of the above is correct.

Assuming that x and y have been declared as valid integer values, which of the following is equivalent to this statement?

(x > 15 && x < 18) || (x > 10 || y < 20)

• (x > 15 && x < 18) && (x > 10)

• (y < 20) || (x > 15 && x < 18)

• ((x > 10) || (x > 15 && x < 18)) || (y < 20)

• (x < 10 && y > 20) && (x < 15 || x > 18)