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Java Programming: Evaluating Math Expression

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Java Programming: Evaluating Math Expression

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Questions and Answers

What is the purpose of the System.out.println method in the given program?

To perform arithmetic operations
To declare a variable
To take input from the user
To display the result of the expression on the console (correct)

What is the data type of the result of the expression (10.5 + 2 * 3) / (45 - 3.5)?

float
long
int
double (correct)

Why is the main method declared as static in Java?

To allow the method to be overridden
To allow the method to return a value
To allow the method to be accessed without creating an instance of the class (correct)
To allow the method to take arguments

What would happen if the expression (10.5 + 2 * 3) / (45 - 3.5) evaluates to zero?

The program would throw an ArithmeticException (D) Signup and view all the answers

What is the purpose of the public access modifier in the main method declaration?

To allow access to the method from any other class (C) Signup and view all the answers

What is the data type of the expression ((10.5 + 2 * 3) / (45 - 3.5)) in Java?

double (C) Signup and view all the answers

How would you print the result of the expression ((10.5 + 2 * 3) / (45 - 3.5)) to the console in Java?

System.out.print(((10.5 + 2 * 3) / (45 - 3.5))); (B) Signup and view all the answers

Which of the following is a valid method signature to calculate the expression ((10.5 + 2 * 3) / (45 - 3.5)) in Java?

public static double calculate() (C) Signup and view all the answers

What would be the result of the expression if the condition (45 - 3.5) == 0 were true?

ArithmeticException would be thrown (D) Signup and view all the answers

What is the purpose of the conditional statement if ((10.5 + 2 * 3) / (45 - 3.5)) > 1.0 in Java?

To check if the result is greater than 1.0 (C) Signup and view all the answers

What is the purpose of the Scanner class in Java?

To read input from the user (B) Signup and view all the answers

Which data type would be appropriate to store the month numbers 1-12?

int (D) Signup and view all the answers

What is the name of the access modifier that allows a method to be accessed from any part of the program?

public (C) Signup and view all the answers

What is the purpose of the else statement in a conditional statement?

To execute a block of code when the condition is false (C) Signup and view all the answers

What is the name of the method that is automatically called when an object of a class is created?

constructor (C) Signup and view all the answers

Study Notes

Compute Expression

The code computes the expression ((10.5 + 2 * 3) / (45 - 3.5)) using Java programming language.
The program uses System.out.print and System.out.println to display the result of the expression.
The expression is evaluated as follows: first, 2 * 3 is calculated, then 10.5 is added, and finally, the result is divided by (45 - 3.5).

LAB Compute Expression

The LAB exercise is to compute the same expression ((10.5 + 2 * 3) / (45 - 3.5)).
No additional information is provided for this LAB exercise.

Months Class

The Months class is a Java program that uses the java.util.Scanner class.
The program is related to handling numbers from 1 to 12, which might represent months of the year, but the exact purpose is not clear.

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Description

Evaluate the mathematical expression ((10.5 + 2 * 3) / (45 - 3.5)) in Java programming. Understand how to write a Java program to compute and print the result of the given expression.