Using Variables in Java

Unit 1: Primitive Types - Review Assignment

Why is programming considered an important skill in today's world?

Why is Java widely used in the programming world?

What is the significance of Java being platform-independent?

What does it mean for Java to be an object-oriented programming language?

How does Java's large standard library contribute to its widespread use?

What is the output of the following Java code?

int a = 5;
int b = 10;
int c = a + b;
System.out.println(c);

In Java, what is the difference between the int and double data types?

In Java, what is a boolean variable and what values can it hold?

Declaring and Initializing Variables in Java

10.

Using Variables in Java

11.

Changing the Value of a Variable in Java

12.

Using Variables of Different Types in Java

13.

How would you declare a variable named total of type int and assign it a value of 100 in Java?

14.

How would you write a mathematical expression in Java to add the values of two variables, a and b, and assign the result to a third variable, sum?

15.

How would you write a mathematical expression in Java to multiply the values of two variables, num1 and num2, and assign the result to a third variable, product?

16.

Calculate the area of a rectangle

17.

Calculate the square of a number

18.

Calculate the average of three numbers

19.

Calculate the remainder of a division operation

20.

What is the output of the following Java code?

int a = 5;
a *= 2;
System.out.println(a);

21.

In Java, what does the compound assignment operator += do?

22.

In Java, what does the compound assignment operator /= do?

23.

Using the += operator in Java

24.

Using the -= operator in Java

25.

Using the *= operator in Java

26.

Using the /= operator in Java

27.

What is type casting in Java and why is it used?

28.

What is the difference between implicit and explicit type casting in Java?

29.

What are the risks associated with type casting in Java?

30.

Convert a String to an Integer

31.

Convert an Integer to a String

32.

Convert a Double to an Integer

33.

Convert an Integer to a Double

Write a program that declares and initializes two integer variables a and b with the values 10 and 20 respectively. Then, declare a third integer variable sum and assign it the sum of a and b.

You answeredJUST NOW

Java

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public class Main {
    public static void main(String[] args) {
        // Declare and initialize the variables here
        
        // Testing mechanism - do not modify!
        System.out.println(sum);
    }
}
 
 
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You passed all test cases!

STDIN

Expected STDOUT

Your STDOUT

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Instructor solution

Alec KretchAPR 21, 2024, 8:11:45 AM

Java

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public class Main {
    public static void main(String[] args) {
        // Declare and initialize the variables here
        int a = 10;
        int b = 20;
        int sum = a + b;
        
        // Testing mechanism - do not modify!
        System.out.println(sum);
    }
}
 
 
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How do you use variables in an arithmetic operation in Java?

Select one of the following options:

A.
By using the variable names in the arithmetic expression.
B.
By using the variable names enclosed in quotes in the arithmetic expression.
C.
By using the data types of the variables in the arithmetic expression.
D.
By using the values of the variables in the arithmetic expression.

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