Nerd Stuff 2
Which one of the following operators computes the remainder of an integer division?
%
Which one of the following is a correct representation of the given mathematical expression in Java? a + b 2
(a + b) / 2
Which operator is used to concatenate two or more strings?
+
What is the output of the following code snippet? public static void main(String[] args) { int num1 = 10; int num2 = 5; int num3 = 200; num3 = num3 % (num1 * num2); System.out.println(num3); }
0
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
1,3
What output is produced by these statements? String name = "Joanne Hunt"; System.out.println(name.length());
11
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); }
123456
What is result of evaluating the following expression? (45 / 6) % 5
2
What is the value of Math.abs(-2)?
2
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); }
2345
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);
2424
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); }
25.0
49) 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++; }
31
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); }
36
What is the output of the following code snippet? public static void main(String[] args) { int value = 3; value++; System.out.println(value); }
4
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); }
4562
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); }
49
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); }
579
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); }
7.0
What is the value of Math.pow(2, 3)?
8
What is the value of Math.pow(3, 2)?
9
At what point in the problem-solving process should one write pseudocode?
Before writing Java code, as a guide for a general solution
What is the output of the following code snippet? String firstname = "William"; String lastname; System.out.println("First: " + first); System.out.println("Last: " + lastname);
Code will not compile
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);
Good Java
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 correct way to invoke methods on variables in Java that are strings?
Invoke them using the variable name and the dot (.) notation.
What does the following statement sequence print? String str = "Java"; str += " is powerful"; System.out.println(str);
Java is powerful
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); }
Joe, Good morning
Which one of the following statements gives the absolute value of the floating-point number x = -25.50?
Math.abs(x);
One way to avoid round-off errors is to use:
Math.round()
What does the following statement sequence print? final String str = "Java"; str += " is powerful"; System.out.println(str);
Nothing; compile-time error
Consider the following division statements: I. 22 / 7 II. 22.0 / 7 III. 22 / 7.0 Which of the following is correct?
Only I will return an integer value.
Which of the methods below are static methods? I. length II. Substring III. Pow IV. sqrt
Only III and IV
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);
Statement I compiles, but II does not
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?
String newNumber = "(" + phoneNumber.substring(0, 3) + ")" + phoneNumber.substring(3, 10);
Which of the given System.out.print statements generates the following output? ABCDE"\
System.out.println("ABCDE\"\\");
Which of the given statements generates the following output? \\\"///
System.out.println("\\\\\\\"///");
What is wrong with the following code snippet? int size = 42; cost = 9.99; System.out.println("size = " + size); System.out.println(" cost = " + cost);
The code snippet uses a variable that has not been declared.
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);
The code will not compile
What happens to the fractional part when a division is performed on two integer variables?
The fractional part is discarded.
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))); } a) The new pay is 25000 b) The new pay is 25100 c) The new pay is 27500 d) The new pay is 30000
The new pay is 27500
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));
The new price is 27.0
What is wrong with the following code snippet? int price; price = 9.42;
The price variable is assigned a decimal value.
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);
Unpredictable result
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); }
VE MY
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++; } a) -2 b) 0 c) 2 d) 4
a
Which is the appropriate time to initialize a variable? a) When you define it b) When you use it c) At the end of the program d) Before the main function
a
Which one of the following is a correct method for defining and initializing an integer variable with name value? a) int value = 30; b) Int value = 30; c) int value = .30; d) Int value = .30;
a
Which one of the following statements can be used to extract the last 10 characters from the string variable str? a) str.substring(str.length() - 10, str.length()) b) str.substring(10, str.length()) c) str.substring(str.length() - 9, 10) d) str.substring(0, 10)
a
Which one of the following statements defines a constant with the value 123? a) final int MY_CONST = 123; b) const int MY_CONST = 123; c) final int MY_CONST; MY_CONST = 123; d) static int MY_CONST = 123;
a
Which one of the following statements displays the output as (1.23e+02)? a) System.out.printf("%(5.2e", -123.0); b) System.out.printf("%5.2e", -123.0); c) System.out.printf("^5.2e", -123.0); d) System.out.printf("%5.2E", -123.0
a
Which one of the following statements displays the output as +00321.00? a) System.out.printf("+%09.2f", 321.0); b) System.out.printf("%009,2f", 321.0); c) System.out.printf("+9.2f", 321.0); d) System.out.printf("%09.00f", 321.0
a
Which one of the following statements displays the output as 54321.00? a) System.out.printf("%8.2f", 54321.0); b) System.out.printf("%8,2f", 54321.0); c) System.out.printf(",8.2f", 54321.0); d) System.out.printf("%8.00f", 54321.0);
a
Which option represents the best choice for a variable name to represent the average grade of students on an exam? a) averageGrade b) $averageGrade c) avg d) AveGd
a
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); }
a) The value inside the variable r will be 0.326
Which one of the following types of statements is an instruction to replace the existing value of a variable with another value?
assignment
The assignment operator a) denotes mathematical equality b) places a new value into a variable c) means the same as the equals sign used in algebra d) makes it illegal to write a statement like sum = sum + 4;
b
Which one of the following statements can be used to get the fifth character from a string str? a) char c = str.charAt(5); b) char c = str.charAt(4); c) char c = str[5]; d) char c = str[4];
b
Which statement is true about variable names in Java? a) They can contain the percent sign (%) b) They can contain an underscore symbol ("_") c) They can contain spaces d) They must make sense as a word
b
What are the values of num1 and num2 after this snippet executes? double num1 = 4.20; double num2 = num1 * 10 + 5.0; a) num1 = 4.20 and num2 = 42.0 b) num1 = 4.20 and num2 = 47.0 c) num1 = 42.0 and num2 = 42.0 d) num1 = 42.0 and num2 = 47.0
b)
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*/; a) 1 b) 2 c) 4 d) The code has a syntax error
b) 2
What is the result of the following expression? double d = 2.5 + 4 * -1.5 - (2.5 + 4) * -1.5; a) 24.375 b) 6.25 c) 12.375 d) 6
b) 6.25
Which of the following guidelines will make code more explanatory for others? a) Use more statements in source code. b) Add comments to source code. c) Avoid usage of complex calculations in source code. d) Always enclose the statements in curly braces in source code.
b) Add comments to source code.
What is the meaning of x = 0; in Java?
b) It sets the variable x to zero
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)); } } a) The code snippet uses an uninitialized variable. b) The code snippet uses an undeclared variable. c) The code snippet attempts to assign a decimal value to an integer variable. d) The code snippet attempts to add a number to a string variable.
b) The code snippet uses an undeclared variable.
Which one of the following is an assignment statement?
b) a = 20;
70) Which statement about number literals in Java is false? a) Numbers in exponential notation always have type double b) Zero is an integer c) Integers must be positive d) An integer with fractional part of .0 has type double.
c
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)); } a) The new price is 25 b) The new price is 15 c) The new price is 22.5 d) The new price is 20.0
c
Given the definition final double PI = 3.14159; which of the following is the Java equivalent of the mathematical expression c = radius2 a) c = PI * (radius * 2); b) c = PI * Math.pow(2, radius); c) c = PI * Math.pow(radius, 2); d) c = Math.pow(PI * radius, 2);
c
Which of the following options defines an integer variable? a) char age; b) integer age; c) int age; d) age: int;
c
Which of the following statements displays price = 20.00 a) System.out.print("price = "); System.out.printf(price); b) System.out.print("price = "); System.out.printf("%f", price); c) System.out.print("price = "); System.out.printf("%10.2f", price); d) System.out.print("price = "); System.out.printf("%2.10f", price);
c
Which of the following statements is correct about constants? a) Constants are written using capital letters because the compiler ignores constants declared in small letters. b) The data stored inside a constant can be changed using an assignment statement. c) You can make a variable constant by using the final reserved word when declaring it. d) Constant variables can only be changed through the Math library.
c
Which one of the following statements can be used to convert a string str to a double? a) double n = str.parseDouble(); b) double n = Integer.parseDouble(str); c) double n = Double.parseDouble(str); d) double n = double.parseDouble(str);
c
Which of the following is the Java equivalent of the following mathematical expression? c = 2 radius a) c = 2 * Math.PI * radius * 2; b) c = 2 * Math.PI * Math.pow(2, radius); c) c = 2 * Math.PI * Math.pow(radius, 2); d) c = 2 * Math.PI * radius;
c = 2 * Math.PI * radius;
Which is the Java equivalent of the following mathematical expression? c = (√a + √b)2
c = Math.pow((Math.sqrt(a) + Math.sqrt(b)), 2);
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 a) Only I is valid b) I and II are valid c) II and III are valid d) Only III is valid
c) II and III are valid
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++; a) a = 15, b = 16 b) a = 16, b = 16 c) a = 16, b = 15 d) a = 15, b = 15
c) a = 16, b = 15
Which is the Java equivalent of the following mathematical expression? c = √(a2 + b2) a) c = Math.sqrt(a * 2 + b * 2); b) c = Math.sqrt(a * 2) + Math.sqrt(b * 2); c) c = Math.sqrt(Math.pow(a, 2) + Math.pow(b, 2)); d) c = Math.sqrt(Math.pow(a, 2)) + Math.sqrt(Math.pow(b, 2));
c) c = Math.sqrt(Math.pow(a, 2) + Math.pow(b, 2));
Which one of the following variables is assigned with valid literals? a) int salary = 0; salary = 5000.50; b) int salary1 = 0; salary1 = 1.2E6; c) double salary2 = 0; salary2 = 2.96E-2; d) long salary3 = 0; salary3 = 1E-6;
c) double salary2 = 0; salary2 = 2.96E-2;
Which of the following options declares a float variable? a) Float age; b) flt age; c) float age; d) age: float;
c) float age;
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); }
compile time error
Consider the following Java variable names: I. 1stInstance II. basicInt% III. empName_ IV. addressLine1 V. DISCOUNT Which of the following options is correct? a) Only IV is a valid Java variable name. b) Only I and IV are valid Java variable names. c) Only I, IV, and V are valid Java variable names. d) Only III, IV, and V are valid Java variable names.
d
What is the output of the following code snippet? System.out.printf("%5.3f", 20.0); a) 20 b) 20.0 c) 20.00 d) 20.000
d
Which of the following is the mathematical equivalent of the following Java expression? h = (4.0 * a * b - Math.pow(b, 2)) / c; a) h = 4ab - 2b / c b) h = (4ab - 2b) / c c) h = 4ab - b2 / c d) h = (4ab - b2) / c
d
Which of the following statements is correct about constants? a) Constants are written using uppercase letters because the compiler ignores constants declared in lowercase letters. b) The data stored inside a final variable can be changed using an assignment statement. c) You can make a variable constant by using the constant reserved word while declaring the variable. d) Variables defined using final make a code snippet more readable and easier to maintain.
d
Which one of the following is a correct representation of the given mathematical expression in Java? a) a - b / 2 % 2 b) a - b / 2 c) a - (b / 2) / 2 d) (a - b / 2) / 2
d
Which statement is true? a) Variables cannot be assigned and declared in the same statement b) Variable names must contain at least one dollar sign c) Variable names can be no more than 8 characters long d) It is incorrect to initialize a string variable with a number
d
What is wrong with the following code snippet? int average; average = 78A; a) The average variable is never initialized. b) The data type for the average variable is not specified. c) The average variable is never assigned a value. d) The average variable is assigned a non-numeric value.
d) The average variable is assigned a non-numeric value.
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); } a) 0 b) 3.14 c) 6.28 d) compile-time error
d) compile-time error
What is the result of the following code snippet? double bottles; double bottleVolume = bottles * 2; System.out.println(bottleVolume);
doesn't compile
In an airline reservation system, the cost of an airline ticket is required. Which data type should be used to store this value?
double
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
hry
The typical ranges for integers may seem strange but are derived from a) Base 10 floating-point precision b) Field requirements for typical usage and limits c) Overflows d) Powers of two because of base 2 representation within the computer
idk man didn't give answer on doc
problem solving process emphasizes a "first, do-it-by-hand" approach because
if programmers cannot compute a solution by hand, it is unlikely they will be able to write a program that can do it.
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?
int
Which one of the following reserved words is used in Java to represent a value without a fractional part?
int
Which of the following statements places input into the variable value given this line of code? Scanner in = new Scanner(System.in);
int value = in.nextInt();
Which one of the following refers to a number constant that appears in code without explanation?
magic number
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); }
no output due to a run time error
What are the values of num1 and num2 after this snippet executes? double num1 = 4.20; double num2 = num1 * 10 + 5.0;
num1 = 4.20 and num2 = 47.0
Which of the following is the Java equivalent of the following mathematical expression? p = 2 (radius)3
p = 2 * Math.PI * Math.pow(radius, 3);
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); }
run time error
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);
run time error
How do you compute the length of the string str?
str.length()
How do you extract the first 5 characters from the string str?
str.substring(0, 5)
Which one of the following statements can be used to extract the last five characters from any string variable str?
str.substring(str.length() - 5, str.length())
What is the result of the following statement? String s = "You" + "had" + "me" + "at" + "hello";
string s has the following value: "Youhadmeathello"
The first step in problem solving is
understand the problem and its inputs and outputs
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;
x = 20, y = 10
