Exam 2: Data and Expressions

Which of the following is true regarding the mod operator, %?

Assume that x and y are ints equal to 10 and 5 respectively. What is the output of the following statement? System.out.println(x + y);

As explained in the Software Failure section in the text, the Mars Lander most likely crash landed when its descent engines cut off too high over the Mars surface.

What are the syntax errors from the following program? public class Enigma { public static void main(String[] args) { System.out.println("Input a String"); String x = scan.nextString(); int size = x.length; char last = x.charAt(size); System.out.println("The last character in your string ", x, " is ", last); } }

If you want to output a double so that at least one digit appears to the left side of the decimal point and exactly one digit appears to the right side, which pattern would you give a DecimalFormat variable when you instantiate it?

What will be the result of the following assignment statement, given that b = 5 and c = 10? int a = b * (-c + 2)/2;

Unlike the String class where you must pass a message to an object (instance) of the class, as in x.length(), in order to use either the Scanner or Math classes, you pass messages directly to the class name, as in Math.abs()or scan.nextInt().

Write a program which will input an int value, x, and compute and output the values of 2^x and x^10 as int values.

Java is a strongly typed language. What is meant by "strongly typed"?

Given three int variables with the values a = 5, b = 7, and c = 12, what is the value of z after the following statement is executed? int z = (a * b - c) / a;

How many ways are there to test to see if two String variables, a and b, are equal to each other if we ignore their case (for instance, "aBCd" would be considered equal to "ABcd")?

Write an assignment statement to compute the gas mileage of a car where the int values milesTraveled and gallonsNeeded have already been input. The variable gasMileage needs to be declared and should be a double.

Given four int values, x1, x2, y1, y2, write the code to compute the distance between the two points (x1, y1) and (x2, y2), storing the result in the double distance.

The following statement will output __________ lines of text. System.out.println("1 big bad wolf\t8 the 3 little pigs\n4 Dinner\r2night");

The Random class has a method, nextFloat() which returns a random float value between

Example Code Ch 02-2 import java.util.Scanner; public class Questions33_34 { public static void main(String[] args) { int x, y, z; double average; Scanner scan = new Scanner(System.in); System.out.println("Enter an integer value"); x = scan.nextInt(); System.out.println("Enter another integer value"); y = scan.nextInt(); System.out.println("Enter a third integer value"); z = scan.nextInt(); average = (x + y + z) / 3; System.out.println("The result of my calculation is " + average); } } -Refer to Example Code Ch 02-2. What is the output if x = 0, y = 1, and z = 1?

Given String name = "Arleen Crabtree". What will the following instruction return? name.toUpperCase().replace('R', 'Z');

If x is a String, then x = new String("OH"); and x = "OH"; will accomplish the same thing.

Example Code Ch 02-1 public class Questions1_4 { public static void main(String[] args) { System.out.print("Here"); System.out.println("There " + "Everywhere"); System.out.println("But not" + "in Texas"); } } -Refer to the class definition in Example Code Ch 02-1. The final println command will output

Given x is a double and has the value 0.362491. To output this value as 36%, you could use the NumberFormat class with: NumberFormat nf = NumberFormat.getPercentInstance(); Which of the following statements then would output x as 36%?