Download CPS 180 Exam 1 Questions and Answers 2023: Java Programming Fundamentals and more Exams Health sciences in PDF only on Docsity!
CPS 180 Exam 1 Questions and Answers 2023|
Latest Update (Graded A+).
Keywords - answers>Lower case words reserved by java (can't be identifiers) ex: public, static, class, void Expressions - answers>a part of a statement (like a clause) Statements (source code) - answers>a complete java instruction that causes the computer to perform an action The name of the .java source code - answers>must match the name of the class Bytecode - answers>what java compiles to so the virtual machine interprets and runs WORM language - answers>java can write once and run many Programming process - answers>1. Define what the program does
- Visualize the program running on the computer (try to create it in your mind)
- Use design tools to create a model of the program (use pseudocode)
- Check the model for logical errors
- Enter the code and compile it
- Correct any errors found and repeat 5/
- Run program with test data for input
- Correct runtime errors and repeat 5-
- Validate the results of the program (see if it solves original problem) Logical errors - answers>mistakes that cause the program to produce erroneous results Runtime errors - answers>Errors that occur while your program runs RAM - answers>Random Access Memory, divided into bytes, you can pick any two random locations and it will take the same time to access the data Algorithm - answers>instructions given to solve the problem Variables - answers>created by programmer who assigns it a programmer- defined identifier (ex: hours) a named storage location in the computer's memory
print functions - answers>print : prints message println : advances cursor to next line after message printf : allows for changing format of printed message Java escape sequences - answers>\n : newline \t : tab \b : backspace \r : carriage return (takes cursor to beginning of current line) \ : backslash (prints backslash) ' : single quote (prints single quote) " : double quote (prints) String Concatenation - answers>Combining several strings into a single string, or combining a string with other data into a new, longer string. Literal - answers>a value that is written into the code of a program Legal: 123, 4, 's', "hello" Not legal: 'dfsjd' byte - answers>1 byte, range -128 to +
short - answers>2 bytes, range -32,768 to +32, int - answers>4 bytes, range -2,147,483,648 to +2,147,483, long - answers>8 bytes, range -9,223,372,036,854,775,808 to +9,223,372,036,854,775, float - answers>4 bytes, range ±3.410 x 10^-38 to ±3.410 x 10^38, with 7 digits of accuracy double - answers>8 bytes, range ±1.710 x 10^-308 to ±1.710 x 10^308, with 15 digits of accuracy boolean - answers>True or False char - answers>single character Unicode - answers>character data, set of 65536 characters Arithmetic Operators - answers>+ : addition
- : subtraction
- : multiplication / : division % : modulus += : adds number given to original (x+=5 ... x=x+5)
String Methods - answers>A string is a class, so objects that are instances of it have methods meant to manipulate string objects Length method - answers>a string method that runs the length method on the object pointed to by the value variable ex: stringSize = value.length( ); Comments - answers>// : single line comment /.../ : block comment /*.../ : allows comments to be documented by the javadoc Scanner - answers>reads input from the keyboard
- import java.util.Scanner;
- Scanner keyboard = new Scanner(System.in); if statement - answers>decides whether or not a code is executed, uses a boolean Relational Operators - answers>> : greater than < : less than
= : greater than or equal to <= : less than or equal to == : equal to != : not equal to
Comparing Characters - answers>Characters are ordinal (they have order) so they can be compared ex: char c = 'A'; if (c < 'Z') System.out,println("A is less than Z"); if-else statements - answers>adds the ability to conditionally execute the code when the if condition is false Nested if statements - answers>if statement inside another if statement that is only executed if the outer is true if-else-if statements - answers>use if then else if then else can make nested logic simpler to write
