Data Types and Variables
What character starts and stops the text string input into the println() function?
"
What text string is printed to the screen with this statement? System.out.println("#\"##\\#");
#"##\#
What is the smallest possible integer value that can be stored in a 𝗯𝘆𝘁𝗲 data type?
-128
What is the smallest possible integer value that can be stored in a 𝗶𝗻𝘁 data type?
-2,147,483,648
What is the smallest possible integer value that can be stored in a 𝘀𝗵𝗼𝗿𝘁 data type?
-32,768
What is the smallest possible integer value that can be stored in a 𝗹𝗼𝗻𝗴 data type?
-9,223,372,036,854,775,808
After the following statement, what value is stored in the myInteger variable? int myInteger;
0
What is the value of 𝗿𝗲𝘀𝘂𝗹𝘁𝟭 after this code runs? 𝗶𝗻𝘁 value1 = 10; 𝗶𝗻𝘁 value2 = 4; 𝗱𝗼𝘂𝗯𝗹𝗲 result1 = value1 / value2;
2.0
How many copies of the value 42 are created by this code? 𝗶𝗻𝘁 𝗺𝘆𝗜𝗻𝘁𝟭 = 𝟰𝟮; 𝗶𝗻𝘁 𝗺𝘆𝗜𝗻𝘁𝟮 = 𝗺𝘆𝗜𝗻𝘁𝟭; 𝗶𝗻𝘁 𝗺𝘆𝗜𝗻𝘁𝟯 = 𝗺𝘆𝗜𝗻𝘁𝟮;
3
After the following code is run: 𝗱𝗼𝘂𝗯𝗹𝗲 num1 = 9.6; 𝗶𝗻𝘁 num2 = (𝗶𝗻𝘁)num1; What is the value in 𝗻𝘂𝗺𝟮?
9
Which of the following variable names is invalid?
All of these are valid{_myScore; My_1_Score; MyScore}
What is the best naming style to use for a variable that contains a count of the number of frogs in a pond?
All styles are equally valid; just be consisten{frog_count; frogCount; FrogCount}
Which data type can hold exactly two different values?
Boolean
Which data type would you use to hold a true or false value?
Boolean
What is the smallest data type that can hold the value 126?
Byte
Which of the following data types takes up the most bytes of computer memory?
Double
What keyword do you use to ensure a variable can never change values while your program is running?
Final
If you needed to hold the integer value 36,493, which numeric data type would you use?
Int
What are the two main categories of numeric data types as stored in computers?
Integer and Floating Point
What's wrong with always using the largest possible data type to store your data?
Larger data types take more memory
What properties on the Java numeric wrapper classes hold the largest and smallest possible values for that data type?
MAX_VALUE and MIN_VALUE
Which object is used to write output to the console?
System.out
How would you print the following string to the console? "𝗡𝗼𝗻𝗲𝘀𝗲𝗻𝗰𝗲", 𝘀𝗵𝗲 𝘀𝗮𝗶𝗱!
System.out.println("\"Nonsense\", she said!");
What governs a numeric data type's precision and range?
The number of bytes in memory the data occupies
Which of the following variable names is invalid?
They are all invalid.
Which escape character can be used to insert a backslash in a string?
\\
Which statement correctly assigns the character value 'x' to the 𝗰𝗵𝗮𝗿 variable myChar?
char myChar = 'x';
Which assignment statement correctly assigns a decimal value to the variable "myFloat" that was already declared as a float data type?
myFloat = 2.1F;
What is the difference between the print() and println() functions?
println() will automatically wrap to the next line; print() will not
