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Questions and Answers
Which component of a computer system is responsible for performing mathematical calculations?
Which component of a computer system is responsible for performing mathematical calculations?
- GPU
- CPU (correct)
- RAM
- Hard Drive
In Java, the import statement is used to include external libraries that provide additional functionalities.
In Java, the import statement is used to include external libraries that provide additional functionalities.
True (A)
What is the primary purpose of the main function in a Java program?
What is the primary purpose of the main function in a Java program?
entry point
In the statement int intAge;, int specifies the ________ of the variable.
In the statement int intAge;, int specifies the ________ of the variable.
Match the following Java commands with their corresponding actions:
Match the following Java commands with their corresponding actions:
Which of the following variable types is used to store decimal numbers in Java?
Which of the following variable types is used to store decimal numbers in Java?
Comments in Java code are ignored by the compiler and are used for documentation purposes.
Comments in Java code are ignored by the compiler and are used for documentation purposes.
What does the % operator do in Java?
What does the % operator do in Java?
In Java, the Math.pow(base, exponent) function calculates the ________ of a number.
In Java, the Math.pow(base, exponent) function calculates the ________ of a number.
Which of the following is the correct way to declare a String variable named strMessage in Java?
Which of the following is the correct way to declare a String variable named strMessage in Java?
Java variable names can start with a number if they contain letters after the number.
Java variable names can start with a number if they contain letters after the number.
In the context of the programs, which library is imported using import arc.*;?
In the context of the programs, which library is imported using import arc.*;?
The command con.read________() is used to take double input from user
The command con.read________() is used to take double input from user
Given the code int result = 17 % 5;, what value will result hold?
Given the code int result = 17 % 5;, what value will result hold?
Match each math function with its description:
Match each math function with its description:
The primary role of RAM is to perform calculations, similar to the CPU.
The primary role of RAM is to perform calculations, similar to the CPU.
Explain the purpose of the following line of code: Console con = new Console();
Explain the purpose of the following line of code: Console con = new Console();
According to Cadawas’ variable naming style, a double variable representing a student's average should start with _____.
According to Cadawas’ variable naming style, a double variable representing a student's average should start with _____.
Which line of code would correctly calculate the average of four double variables (dblA, dblB, dblC, dblD) and store the result in dblAverage?
Which line of code would correctly calculate the average of four double variables (dblA, dblB, dblC, dblD) and store the result in dblAverage?
Math functions like Math.sin() and Math.cos() in Java use degrees as their input.
Math functions like Math.sin() and Math.cos() in Java use degrees as their input.
Flashcards
Data Flow in Computing
Data Flow in Computing
The flow of data within a computer system: Input, Storage (RAM), Processing (CPU), and Output.
Console Output Command
Console Output Command
A command that displays text or variables in the console window.
RAM Variable Command
RAM Variable Command
Reserves space in RAM for storing data; includes a variable name and data type.
Keyboard Input Command
Keyboard Input Command
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CPU Math Command
CPU Math Command
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String Data Type
String Data Type
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Integer Data Type
Integer Data Type
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Double Data Type
Double Data Type
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Cadawas' Variable Naming Style
Cadawas' Variable Naming Style
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Comments in Code
Comments in Code
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Math Functions in Java
Math Functions in Java
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Importing Libraries in Java
Importing Libraries in Java
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Java Class Definition
Java Class Definition
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Main Function in Java
Main Function in Java
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Console in arc Library
Console in arc Library
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Basic Java Skeleton
Basic Java Skeleton
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Modulus Operator (%)
Modulus Operator (%)
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Study Notes
- Data flow in a computer system involves input, storage in RAM, manipulation by the CPU, and output.
- Java programming involves commands to read data, store data in variables, perform calculations, and output data.
Basic Java Program Structure
import arc.*;imports libraries for extra Java commands.- Libraries provide access to input/output devices and advanced CPU math functions (sound, 3D, network).
public class basics1{ }defines the program's title, which cannot have spaces or start with a number.- The file should be saved with the same title and the
.javaextension. public static void main(String[] args){ }represents the main function, where the program's execution begins.Console con = new Console();accesses the console, a popup window for input and output.
Input/Output
con.println("Hello World");prints the text within the quotes to the console window.
RAM and Keyboard Commands
String strName;reserves space in RAM for a variable namedstrNameto store String data (words, letters, punctuation, phrases, or numbers).strName = con.readLine();reads a line of String data from the keyboard and stores it in thestrNamevariable.con.println("The best person is: "+strName);prints the text within the quotes along with the data stored in thestrNamevariable.
Integer Variables and CPU Math
int intAge;reserves space in RAM for a variable namedintAgeto store integer data (whole numbers).intAge = con.readInt();reads integer data from the keyboard and stores it in theintAgevariable.intDays = intAge * 365;performs a CPU calculation and stores the result in theintDaysvariable.
Math Operators
*is the multiplication operator./is the division operator.+is the addition operator.-is the subtraction operator.%is the modulus operator, which returns the remainder of integer division (e.g.,17%5 = 2).()are brackets to force the order of operations.
Double Variables
double db1Mark1;reserves space in RAM for a variable nameddblMark1to store double data (numbers with a decimal point).db1Mark1 = con.readDouble ();reads numbers with decimal data from the keyboard and stores it in thedblMark1variable.
Variable Naming Style
- All variables should start with three letters representing the variable type.
stris for String.intis for Integer.dblis for Double.- The rest of the variable name should represent the data that is going into the variable.
Comments
//indicates a comment, which is not code and is not converted to binary.- Comments can explain what is happening in the code.
- Comments facilitate communication with team members.
Math Functions
dblResult = Math.sqrt(dblNumber);calculates the square root of a number.dblResult = Math.pow(dblBase, dblExponent);calculates the power or exponent.dblResult = Math.round(dblNumber);rounds a number to the nearest whole number.dblResult = Math.sin(dblRadians);calculates the sine of an angle in radians.dblResult = Math.cos(dblRadians);calculates the cosine of an angle in radians.dblResult = Math.tan(dblRadians);calculates the tangent of an angle in radians.dblRadians = Math.toRadians(dblDegrees)converts an angle from degrees to radians. Java trig uses radians.
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