ITSC 1213 MAIN EXAMINATION QUESTIONS AND ANSWERS SET A.pdf

ITSC 1213 MAIN EXAMINATION QUESTIONS AND
ANSWERS SET A+
✔✔int - ✔✔> 4 bytes
> Integers in the range of -2,147,483,648 to +2,147,483,647

✔✔long - ✔✔> 8 bytes
> Integers in the range of -9,223,372,036,854,775,808 to +9,223,372,036,854,775,807

✔✔float - ✔✔> 4 bytes
> Floating-point numbers in the range of ±3.4 x 10-38 to ±3.4 x 1038, with 7 digits of
accuracy

✔✔double - ✔✔> 8 bytes
> Floating-point numbers in the range of ±1.7 x 10-308 to ±1.7 x 10308, with 15 digits of
accuracy

✔✔Variable Declarations take the following form: - ✔✔DataType VariableName;

✔✔Integers embedded into ___ are called ___ - ✔✔> Java source code
> integer literals

✔✔single precision - ✔✔> float
> 7 decimal points

✔✔double precision - ✔✔> double
> 15 decimal points

✔✔boolean - ✔✔> true/false
> can only be copied into another boolean

✔✔char - ✔✔> single character
> enclosed in single quotes ('\n')

,✔✔In order to store a value in a variable ___ - ✔✔you must use the assignment
operator (=)

✔✔The variables must be ___ before they can be used - ✔✔declared

✔✔Values assigned must be ___ with the variable's declared type. - ✔✔compatible

✔✔arithmetic operators - ✔✔(+) (-) (*) (/) (%)

✔✔division operator (/) - ✔✔divides two numbers and drops the remainder

✔✔modulus (%) - ✔✔divides twp numbers but only returns the remainder

✔✔operators are called binary operators because ___ - ✔✔they must have two
operands

✔✔the secret to java is ___ - ✔✔extreme vape

✔✔the second secret to java is ___ - ✔✔getting real thicc

✔✔Math class - ✔✔> contains methods that perform complex mathematical operations

Ex. Math.pow(number, power); and Math.sqrt(number)

✔✔combined assignment operators - ✔✔> (+=) (-=) (*=) (/=) (%=)
> allow the programmer to perform an arithmetic operation and assignment with a single
operator

✔✔Java is a ___ language - ✔✔strongly typed

✔✔Java performs some conversions between data types automatically, but does not
___ - ✔✔automatically perform any conversion that can result in the loss of data

✔✔widening conversion scale: - ✔✔Higher Rank^
> double
> float
> long
> int
> short
> byte
Lower Rank^

, ✔✔Storing values of higher-ranked data types into variables of lower-ranked type is
called ___. It will create a ___ error. - ✔✔> narrowing conversion
> compiler

✔✔cast operator - ✔✔> lets you manually convert a value, even if it means that a
narrowing conversion will take place
> consist of the destination type enclosed in ()

Ex. int x = (int) 4.20; x == 4

✔✔Cast operators can be used to avoid ___ - ✔✔> integer division

Ex. (x= 1/2; x==0) but (x = (double)1/2; x==0.5)

✔✔Constants - ✔✔> variables that can hold only a single value
> value cannot be modified once initialized
> declared using the keyword final
> all upper case and words are separated by the underscore character

Ex. final int CAL_SALES_TAX = 0.725;

✔✔Java has no primitive data type that ___ - ✔✔holds a series of characters

✔✔String class - ✔✔> class variable, not a primitive type
> capital S
> enclosed in double quotes ""
> is a class, so it shares their TitleCase naming conventions
> must reference a String object

✔✔how do primitive variables store values? - ✔✔they store values in the memory
location associated with themselves

✔✔how do class variables store values? - ✔✔they only hold the memory addresses of
the objects that contain their values

✔✔reference / pointer - ✔✔the memory address of the object that contains a value

✔✔variable can be assigned a ___ - ✔✔> String literal

> only works with Strings
> String value = "Hello";
> doesn't need to use the "new" keyword to create another object

✔✔3 methods for commenting Java code - ✔✔(//) (/* words */) (/** words*/)