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memorize.aimemorize.ai (lvl 286)
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32 cards
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Section 1

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Which symbol correctly completes the following variable declaration? char c = _g_; " % + - '

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Last updated

6 years ago

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Mar 1, 2020

Cards (32)

Section 1

(32 cards)

Which symbol correctly completes the following variable declaration? char c = _g_; " % + - '

Front

'

Back

What is the output? System.out.println("Hello,
\tWorld");

Front

Hello, World

Back

What is output by the following code? int val = -2; val++; val--; val++; val++; val++; val--; val++; 0, 1, 2, 3, 4, 5

Front

1

Back

What is the output from: ifElseMystery(10, 3); public static void ifElseMystery(int a, int b){ if(a < b){ a = a * b; } if(a > b){ a = a - 10; }else{ b++; } System.out.println(a + " " + b); }

Front

0 3

Back

Evaluate: 54 % 10 + 8 * 3 % 9

Front

10

Back

Which of the following is NOT a primitive data type? boolean double int String char

Front

String

Back

Evaluate: String s = "ASD CS rocks"; "!" + s.chartAt(2) + s.charAt(8) + ": " + s.length() + "!";

Front

!Do: 12!

Back

Does the following code need a cast? ______ If so, what should you type to cast? ______ int val = 13.2; no, none yes, (decimal) yes, (double) yes, (int) yes, (char)

Front

yes, (int)

Back

The following code is intended to input three integers and print the average. What is a potential problem with the code as written? System.out.println("please enter three digits"); int a = scan.nextInt(); int b = scan.nextInt(); int c = scan.nextInt(); System.out.println("The answer is: " 1.0*a + b + c / 3); 1. It needs ( ) so the order of operations happens correctly. 2. No correction needed, the code will work as written. 3. It should be divided by 2, not 3. 4. It should use scan.nextDouble instead of scan.nextInt. 5. The parenthesis are not needed and will cause a mathematical error.

Front

1

Back

What is output by the following code? int c = 3 - 37 % 1; System.out.printlin(c);

Front

2;

Back

Assuming that scan is a properly initialized Scanner variable, which of the following correctly inputs a double? double val = scan.nextValue(); double val = scan.nextDouble; double val = scan.nextDouble(); double val = nextDouble(); double val = scan.nextLine();

Front

double val = scan.nextDouble();

Back

Which of the following needs a cast? char stored in an int variable double stored in an int variable char stored in a String variable int stored in a double variable char stored in a double variable

Front

double stored in an int variable

Back

QOD.1 What is the output of the following code? int a = 10; int b = 5, for(int i = 0; i < a; i+=2){ for(int j = 0; j <= i % b; j++){ System.out.print("* "); } System.out.println(); }

Front

** ** * *

Back

Considering the following code, which option is an example of short circuit evaluation? if(a < b && c != d) 1. if a < b is true it doesn't evaluate c != d 2. if a < b is false it doesn't evaluate c != d 3. if c != d is false it evaluates a < b 4. if c != d is true it doesn't evaluate a < b 5. if a < b is true it evaluates c != d

Front

if a < b is false it doesn't evaluate c != d

Back

Convert 54 to binary

Front

110110

Back

In Java all output uses the ______ data type. int scan String double char

Front

String

Back

Evaluate: 2.3 * 3 + 19 / 5 / 2 + 6.0 / 5

Front

9.1

Back

Which character below is not allowed in a variable name? W q 3 &

Front

&

Back

Put the following data types in order from smallest to largest (in terms of memory used) 1. double, char, int, String 2. int, char, double, String 3. char, int, double, String 4. double, int, char, String 5. int, double, char, String

Front

3

Back

Evaluate: 10 - 5 5 (2 - 6 + 8)

Front

-90

Back

Assuming that scan is a properly initialized Scanner variable, which of the following correctly inputs a double? double val = scan.nextValue(); double val = scan.nextDouble; double val = scan.nextDouble(); double val = nextDouble(); double val = scan.nextLine();

Front

double val = scan.nextDouble();

Back

What is output? int a = 91; System.out.println(a/2);

Front

45

Back

What are if statements used for in programs? Repeating commands Storing data Numeric calculations Numeric casts Making decisions

Front

Making decisions

Back

Which of the following correctly stores the word umbrella in a variable called stuff? String umbrella = "stuff"; String "stuff" = "umbrella"; String stuff = umbrella; String stuff = "umbrella"; String umbrella = stuff;

Front

String stuff = "umbrella";

Back

Evaluate: 3 2 + 4 + "+" + 2 + 3 4 *

Front

10+212

Back

Which of the following variable assignments is legal in Java? double n = 3; int x = 5.0/2; int q = 82.3847; char l = "G";

Front

double n = 3;

Back

Which if statement below tests if letter holds J? (letter is a char) if ( letter == 'J') if ( letter == J) if ( letter >= 'J') if ( letter = 'J') if ( letter == "J")

Front

if ( letter == 'J')

Back

What is the output of the following code? double x = -97.6; System.out.println(Math.abs(x)); -98 -97.6 -96 97.6 98

Front

97.6

Back

Convert 0110 1001 to decimal

Front

105

Back

Correct the following code: char q = -82; char q = (char)Math.sqrt(-82); char q = int(-82); char q =(int) -82; char q =(char)Math.abs(-82); No changes, the code is fine.

Front

char q = int(-82);

Back

Which is the best way to avoid roundoff error? 1. Use booleans for calculations. 2. Convert double values to ints and do calculations using integers. 3. Convert int values to doubles and do calculations using doubles. 4. Convert char values to doubles and do calculations using doubles. 5. Do all calculations using doubles.

Front

2

Back

Evaluate: 3 / (double) 2 + 3 / 2 + (double) 3 / 2

Front

4.0

Back