CSE Chapter 2 Quiz

Which of the following options declares a float variable?

What is the result of the following code snippet? public static void main(String[] args { double circleRadius; double circleVolume = 22 / 7 * circleRadius * circleRadius; System.out.println(circleVolume); }

What is wrong with the following code snippet? public class Area { public static void main(String[] args) { int width = 10; height = 20.00; System.out.println("area = " + (width * height)); } }

What is wrong with the following code snippet? int average; average = 78A;

Which of the following guidelines will make code more explanatory for others?

What will be the value stored in the variable x after the execution of the following code snippet? int a = 10; int b = 20; int c = 2; int x = b / a /*c*/;

Which of the following statements with comments is(are) valid? I. int cnt = 0; /* Set count to 0 II. int cnt = 0; /* Set count to 0 */ III. int cnt = 0; // Set count to 0

What is wrong with the following code? int count = 2000 * 3000 * 4000;

Which one of the following variables is assigned with valid literals?

What will be the value inside the variables a and b after the given set of assignments? int a = 20; int b = 10; a = (a + b) / 2; b = a; a++;

What is the value inside the value variable at the end of the given code snippet? public static void main(String[] args) { int value = 3; value = value - 2 * value; value++; }

What are the values of num1 and num2 after this snippet executes? double num1 = 4.20; double num2 = num1 * 10 + 5.0;

What is the result of the following expression? double d = 2.5 + 4 * -1.5 - (2.5 + 4) * -1.5;

What is the output of the following code snippet? public static void main(String[] args) { int value = 3; value++; System.out.println(value); }

What is the output of the following code snippet? public static void main(String[] args) { int value = 25; value = value * 2; value--; System.out.println(value); }

Assuming that the user inputs a value of 25 for the price and 10 for the discount rate in the following code snippet, what is the output? public static void main(String[] args) { Scanner in = new Scanner(System.in); System.out.print("Enter the price: "); double price = in.nextDouble(); System.out.print("Enter the discount rate: "); double discount = in.nextDouble(); System.out.println("The new price is " + price - price * (discount / 100.0)); }

Which of the following statements is correct about constants?

Which one of the following operators computes the remainder of an integer division?

What is the value of Math.pow(3, 2)?

What is the output of the following code snippet? public static void main(String[] args) { double a; a = Math.sqrt(9.0) + Math.sqrt(16.0); System.out.println(a); }

Which is the Java equivalent of the following mathematical expression? c = ?(a2 + b2)

Which one of the following is a correct representation of the given mathematical expression in Java? (a + b)/2

Which of the following is the Java equivalent of the following mathematical expression? c = 2 radius

What is the result of the following statement? String s = "You" + "had" + "me" + "at" + "hello";

Which operator is used to concatenate two or more strings?

What output is produced by these statements? String name = "Joanne Hunt"; System.out.println(name.length());

How do you compute the length of the string str?

What is the output of the following code snippet? public static void main(String[] args){ { String str1; str1 = "I LOVE MY COUNTRY"; String str2 = str1.substring(4, 9); System.out.println(str2); }

What is the output of the following code snippet? public static void main(String[] args) { int s; double f = 365.25; s = f / 10; System.out.println(s); }

Assuming that the user inputs "Joe" at the prompt, what is the output of the following code snippet? public static void main(String[] args) { System.out.print("Enter your name "); String name; Scanner in = new Scanner(System.in); name = in.next(); name += ", Good morning"; System.out.print(name); }

Which one of the following refers to a number constant that appears in code without explanation?

What happens to the fractional part when a division is performed on two integer variables?

Consider the following division statements: I. 22 / 7 II. 22.0 / 7 III. 22 / 7.0 Which of the following is correct?

Which of the following options is valid with reference to the code snippet? public static void main(String[] args) { double d = 45.326; double r = d % 9.0; System.out.println(r); }

What is the output of the following code snippet? public static void main(String[] args) { int var1 = 10; int var2 = 2; int var3 = 20; var3 = var3 / (var1 % var2); System.out.println(var3); }

Which one of the following statements gives the absolute value of the floating-point number x = -25.50?

Assuming that the user enters 45 and 62 as inputs for n1 and n2, respectively, what is the output of the following code snippet? public static void main(String[] args) { System.out.print("Enter a number: "); Scanner in = new Scanner(System.in); String n1 = in.next(); System.out.print("Enter another number: "); String n2 = in.next(); String result = n1 + n2; System.out.print(result); }

Which of the methods below are static methods? I. length II. Substring III. Pow IV. sqrt

Which one of the following statements can be used to extract the last five characters from any string variable str?

Assuming that the user inputs a value of 25000 for the pay and 10 for the bonus rate in the following code snippet, what is the output? public static void main(String[] args) { Scanner in = new Scanner(System.in); System.out.print("Enter the pay: "); double pay = in.nextDouble(); System.out.print("Enter the bonus rate: "); double bonus = in.nextDouble(); System.out.println("The new pay is " + (pay + pay * (bonus / 100.0))); }

What is the value of Math.abs(-2)?

What is the output of the following code snippet? public static void main(String[] args) { double x; x = Math.pow(3.0, 2.0) + Math.pow(4.0, 2.0); System.out.println(x); }

Which is the Java equivalent of the following mathematical expression? c = (?a + ?b)2

Which of the following is the Java equivalent of the following mathematical expression? p = 2 (radius)3

How do you extract the first 5 characters from the string str?

Which of the given System.out.print statements generates the following output? ABCDE"

Which of the given statements generates the following output? "///

What will be the value inside the variables x and y after the given set of assignments? int x = 20; int y = 10; x = (x - y) * 2; y = x / 2;

What is the value inside the var variable at the end of the given code snippet? public static void main(String[] args) { int var = 30; var = var + 2 / var; var++; }

Assuming that the user enters 23 and 45 as inputs for num1 and num2, respectively, what is the output of the following code snippet? public static void main(String[] args) { Scanner in = new Scanner(System.in); System.out.print("Enter a number: "); String num1 = in.next(); System.out.print("Enter another number: "); String num2 = in.next(); System.out.println(num1 + num2); }

Which one of the following statements can be used to extract the last 10 characters from the string variable str? str.substring

Which one of the following statements can be used to convert a string str to a double?

Which one of the following statements can be used to get the fifth character from a string str?

Which one of the following statements displays the output as 54321.00?

Which one of the following statements displays the output as (1.23e+02)?

Which one of the following statements defines a constant with the value 123?

Which one of the following statements displays the output as +00321.00?

One way to avoid round-off errors is to use:

What (if any) type of error occurs with the following code if the user input is ABC? public static void main(String[] args) { Scanner in = new Scanner(System.in); System.out.print("Enter a number: "); String str = in.next(); int count = Integer.parseInt(str); System.out.println("Input is " + count); }

What does the following statement sequence print? String str = "Harry"; int n = str.length(); String mystery = str.substring(0, 1) + str.substring(n - 2, n); System.out.println(mystery);

What does the following statement sequence print? String str = "Hello"; int n = str.length(); String mystery = str.substring(0, 1) + str.substring(n - 2, n + 1); System.out.println(mystery);

What does the following statement sequence print? String str = "Java Is Good"; int n = str.length(); String mystery = str.substring(n - 4, n) + str.charAt(4) + str.substring(0, 4); System.out.println(mystery);

What does the following statement sequence print? final String str = "Java"; str += " is powerful"; System.out.println(str);

What does the following statement sequence print? String str = "Java"; str += " is powerful"; System.out.println(str);

What does the following statement sequence print if the user input is 123? public static void main(String[] args) { Scanner in = new Scanner(System.in); System.out.print("Enter a number "); int myInt = in.nextInt(); myInt += 456; System.out.println(myInt); }

What does the following statement sequence print if the user input is 123? public static void main(String[] args) { Scanner in = new Scanner(System.in); System.out.print("Enter a number: "); String str = in.next(); str += 456; System.out.println(str); }

What is the output of the following statement sequence? public static void main(String[] args) { int x = 100.0 % 6.0; System.out.println(x); }

Which statement is true?

Which statement about number literals in Java is false?

Which option represents the best choice for a variable name to represent the average grade of students on an exam?

The assignment operator

Which of the following statements about constants in Java are true? I. Although not required, constants are commonly named using uppercase letters II. Only integer values can appear as constants III. A variable can be defined with an initial value, but the reserved word final prevents it from being changed IV. A named constant makes computations that use it clearer I, III, IV

What is the output of this code snippet? int sum = 22; sum = sum + 2; System.out.print(sum); // sum = sum + 4; System.out.print(sum);

What is the output of this code snippet? double average; int grade1 = 87; int grade2 = 94; // System.out.print("The average is " + (grade1 + grade2) / 2.0); System.out.print("The average is " + average);

What is the output of the following code snippet? int counter = 0; counter++; System.out.print("The initial value of the counter is "); System.out.println(count);

Which statements about numeric types in Java are true? I. There is more than one integer type II. The data type float uses twice the storage of double III. The numeric range of the Java integer type is related to powers of two

The typical ranges for integers may seem strange but are derived from

What is result of evaluating the following expression? (45 / 6) % 5

What is the difference between the result of the following two Java statements? I. int cents = (int)(100 * price + 0.5); II. int cents = (100 * price + 0.5);

At what point in the problem-solving process should one write pseudocode?

The problem solving process emphasizes a "first, do-it-by-hand" approach because

What is the output of the following code snippet? String firstname = "William"; String lastname; System.out.println("First: " + first); System.out.println("Last: " + lastname);

What is the correct way to invoke methods on variables in Java that are strings?

Suppose a phone number, stored as a ten-character string (of digits only) called phoneNumber, must be converted into a string that has parentheses around the area code. Which statement below will do that?

Which of the following options defines an integer variable?

Which statement is true about variable names in Java?

Consider the following Java variable names: I. 1stInstance II. basicInt% III. empName_ IV. addressLine1 V. DISCOUNT Which of the following options is correct?

Which is the appropriate time to initialize a variable?

What is the result of the following code snippet? double bottles; double bottleVolume = bottles * 2; System.out.println(bottleVolume);

Which one of the following is a correct method for defining and initializing an integer variable with name value?

What is wrong with the following code snippet? int size = 42; cost = 9.99; System.out.println("size = " + size); System.out.println(" cost = " + cost);

Which one of the following reserved words is used in Java to represent a value without a fractional part?

In an airline reservation system, the number of available seats in an airplane is required. Which data type should be used to store this value?

In an airline reservation system, the cost of an airline ticket is required. Which data type should be used to store this value?

What is wrong with the following code snippet? int price; price = 9.42;

Which one of the following is an assignment statement?

Which one of the following types of statements is an instruction to replace the existing value of a variable with another value?

What is the meaning of x = 0; in Java?

What are the values of num1 and num2 after this snippet executes? double num1 = 4.20; double num2 = num1 * 10 + 5.0;

Which of the following statements places input into the variable value given this line of code? Scanner in = new Scanner(System.in);

Assuming that the user inputs a value of 30 for the price and 10 for the discount rate in the following code snippet, what is the output? Scanner in = new Scanner(System.in); System.out.print("Enter the price: "); double price = in.nextDouble(); System.out.print("Enter the discount rate: "); double discount = in.nextDouble(); System.out.print("The new price is "); System.out.println(price - price * (discount / 100.0));

Which of the following statements is correct about constants?

What is the value of Math.pow(2, 3)?

Which one of the following is a correct representation of the given mathematical expression in Java?

Given the definition final double PI = 3.14159; which of the following is the Java equivalent of the mathematical expression c = radius^2

Which of the following is the mathematical equivalent of the following Java expression? h = (4.0 * a * b - Math.pow(b, 2)) / c;

Which of the following statements displays price = 20.00

What is the output of the following code snippet? System.out.printf("%5.3f", 20.0);