compound assignment arithmetic operators in java mcq

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Java MCQ Questions - Operators & Assignments

This section focuses on the "operators and assignments" in Java programming. These Multiple Choice Questions (MCQ) should be practiced to improve the Java programming skills required for various interviews (campus interviews, walk-in interviews, company interviews), placements and other competitive examinations.

A. Characters B. Boolean C. Numeric D. Both Numeric & Characters

Explanation: The operand of arithmetic operators can be any of numeric or character type, But not boolean.

A. Both Integers and floating - point numbers B. Integers C. Floating - point numbers D. None of the mentioned

Explanation: Modulus operator can be applied to both integers and floating point numbers..

A. 1 B. 2 C. 3 D. 4

Explanation: Decrement operator, −−, decreases the value of variable by 1.

A. Assignment operators can be used only with numeric and character data type B. Assignment operators are more efficiently implemented by Java run-time system than their equivalent long forms C. Assignment operators run faster than their equivalent long forms D. None of the mentioned

Explanation: None of the mentioned.

A. TRUE B. FALSE C. Can be true or false D. can not say

Explanation: Both data types have different memory representation that is why 8-byte integral data type can be stored to 4-byte floating point data type.

A. 14 B. 12 C. 13 D. 10

Explanation: Output of the expression is 13.

A. ( ) B. { } C. Both A & B D. None of these

Explanation: Parentheses(), Array subscript{} and Member selection- have the same precedence.

A. Compare two boolean values B. Compare two numeric values C. Combine two boolean values D. Combine two numeric values

Explanation: Logical AND(&&) and Logical OR(||) combine two boolean values.

A. ((x 1)) && (x B. ((x 1)) || (x C. (1 > x > 100) || (x D. 1

Explanation: No explanation.

A. \\ B. \v C. \a D. \t

A. 12 15 B. 15 15 C. 3 7 5 3 7 5 D. 3 4 5 3 7 5

Explanation: The reference variables a1 and a3 refer to the same long array object. When the [1] element is updated in the fix() method, it is updating the array referred to by a1. The reference variable a2 refers to the same array object. So Output: 3+7+5+"" ""3+7+5 Output: 15 15 Because Numeric values will be added

A. true true B. true false C. false true D. false false

Explanation: The boolean b1 in the fix() method is a different boolean than the b1 in the start() method. The b1 in the start() method is not updated by the fix() method.

A. s st B. sst st C. st s st D. sst s st

Explanation: When the fix() method is first entered, start()'s s1 and fix()'s s1 reference variables both refer to the same String object (with a value of ""s""). Fix()'s s1 is reassigned to a new object that is created when the concatenation occurs (this second String object has a value of ""sst""). When the program returns to start(), another String object is created, referred to by s2 and with a value of ""st"".

A. (int)Math.min(d); B. (int)Math.abs(d); C. (int)Math.max(d); D. (int)Math.floor(d);

Explanation: The casting to an int is a smokescreen.

A. Compiler Error: Operator >> cannot be applied to negative numbers B. -2 2 C. 2 D. 2 2

Explanation: No explantion.

A. 1, 2 & 3 B. 1 & 4 C. 1, 2, 3 & 4 D. 3 & 2

Explanation: Operator ++ increases value of variable by 1. x = x + 1 can also be written in shorthand form as x += 1. Also x =+ 1 will set the value of x to 1.

A. 0 1 B. 1 1 C. 1.5 1 D. 1.5 1.0

Explanation: No Explanation.

A. s B. t C. h D. Compilation fails

Explanation: This is an example of a nested ternary operator. The second evaluation (x < 22) is true, so the ""t"" value is assigned to sup.

A. 7 B. 0 C. 14 D. 8

Explanation: The & operator produces a 1 bit when both bits are 1. The result of the & operation is 9. The ^ operator produces a 1 bit when exactly one bit is 1; the result of this operation is 10. The | operator produces a 1 bit when at least one bit is 1; the result of this operation is 14.

A. 44 B. 56 C. 48 D. 40

Explanation: Operator ++ has more preference than *, thus g becomes 4 and when multiplied by 8 gives 32.

A. Integer B. Boolean C. Characters D. Double

Explanation: None.

A. Integers B. Floating - point numbers C. Boolean D. None of the mentioned

Explanation: All relational operators return a boolean value ie. true and false.

A. && B. == C. ?: D. +=

Explanation: Operator Short circuit AND, &&, equal to, == , ternary if-then-else, ?:, are boolean logical operators. += is an arithmetic operator it can operate only on numeric values.

A. ! B. | C. & D. &&

Explanation: Operator short circuit and, &&, and short circuit or, ||, skip evaluating right hand operand when output can be determined by left operand alone.

A. true and false are numeric values 1 and 0 B. true and false are numeric values 0 and 1 C. true is any non zero value and false is 0 D. true and false are non numeric values

Explanation: True and false are keywords, they are non numeric values which do not relate to zero or non zero numbers. true and false are boolean values.

A. 1 B. 0 C. TRUE D. FALSE

Explanation: Operator > returns a boolean value. 5 is not greater than 6 therefore false is returned. output: $ javac Relational_operator.java $ java Relational_operator false

A. 0 B. 1 C. 3 D. -4

Explanation: None. output: $ javac ternary_operator.java $ java ternary_operator 3

A. 1 B. 2 C. Runtime error owing to division by zero in if condition D. Unpredictable behavior of program

Explanation: Operator short circuit and, &&, skips evaluating right hand operand if left hand operand is false thus division by zero in if condition does not give an error. output: $ javac Output.java $ java Output 2

A. 0 B. 1 C. FALSE D. TRUE

Explanation: None. output: $ javac Output.java $ java Output false

A. () B. ++ C. * D. >>

Explanation: Order of precedence is (highest to lowest) a -> b -> c -> d.

A. Integer B. Floating - point numbers C. Boolean D. None of the mentioned

Explanation: The controlling condition of ternary operator must evaluate to boolean.

A. 0 B. 1 C. 9 D. 8

A. 1 -> 2 -> 3 B. 2 -> 1 -> 3 C. 3 -> 2 -> 1 D. 2 -> 3 -> 1

A. 10 B. 11 C. 12 D. 56

Explanation: Operator ++ has the highest precedence than / , * and +. var2 is incremented to 7 and then used in expression, var3 = 7 * 5 / 7 + 7, gives 12. output: $ javac operators.java $ java operators 12

A. 24 8 B. 24 9 C. 27 8 D. 27 9

Explanation: Operator ++ has higher precedence than multiplication operator, *, x is incremented to 9 than multiplied with 3 giving 27. output: $ javac operators.java $ java operators 27 9

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• Java Questions Also

Java MCQ Questions and Answers on Arithmetic Operators 1

Study and learn Java MCQ questions and answers on Arithmetic Operators and their priorities. Attend job interviews easily with these Multiple Choice Questions.

Go through Java Theory Notes on Arithmetic Operators  before studying questions.

Numbers are treated as int type by default. So an int value cannot be assigned to a short variable. You have to type cast the whole expression.

Compound assignment operators automatically convert the expression value to the left-hand side data type.

op++, op-- have more priority than --op, ++op.

All are having equal priority.

Again between Prefix and Post operators, Postfix operators have higher priority.

* has higher priority than +. So, Multiplication operation is performed first.

/ and * have equal priority. So associativity of Left to Right is used. Remember that 3/2 is 1 not 1.5 as both operands are integers.

At time of evaluating a++ == --b, a(5)is compared with --b(6-1). So, "if" condition passes. If you check a value after the ELSE block, it will be a+1 i.e 6.

After the ELSE block, b will be b+1 i.e 6

The prefix is incremented or decremented immediately . Postfix incremented or decremented on the next line/statement .

Java Typecasting MCQ Questions

Java MCQs on Relational Operators 1

Arithmetic and Assignment Operators Explained in Java

We promise these Arithmetic and Assignment Operators are more fun than the ones you used in Algebra II.

Arithmetic operators allow you to perform algebraic arithmetic in programming. That is, they enable you to add, subtract, divide and multiply numbers.

This article will also cover assignment operators. These enable you to give (assign) a certain value to a variable.

This tutorial is not just for Java programmers. Many other programming languages like C and Python use these same operators. Therefore, you can easily transfer and apply the knowledge you gain here.

Arithmetic Operators

There are 5 arithmetic operators in Java—the table below summarizes them.

The symbols ( + , - , / ) should seem familiar. That's because they're the same as those typically used in algebra.

It's important to take note that the division operator ( / ) refers to integer division here. That is, 19/5 will evaluate to 3 . Any fractional part that results from this computation is truncated.

Related: What Is a Constructor in Java and How Do You Use It?

You should have also noticed that the Java operator for multiplication is an asterisk ( * ) and not the usual multiplication symbol ( × ).

To get the modulus of two integers, Java uses the % symbol. The example given in the table is similar to the algebraic expression: y mod 3 . The % operator gives the remainder after y is divided by 3 . That is, 19%5 will evaluate to 4 .

It's good practice to use parentheses for grouping subexpressions. This eases readability and helps to avoid logic and syntax errors.

When you have multiple arithmetic operators in one expression, Java uses the rules of operator precedence to determine which subexpressions to evaluate first.

The table below categorizes the levels of operator precedence.

The operators ( * , / , % ) have the highest level of precedence, then followed by ( + , - ) and finally ( = ). The operators ( * , / , % ), and ( + , - ) all associate from left to right. This simply means that their evaluation begins from the leftmost operator.

The third operator ( = ) associates from right to left. So if have x=3 , that means 3 is assigned to x , and not x is assigned to 3.

Assignment Operators

The assignment operator ( = ) assigns a value to a variable.

The above expression adds 7 to y and then assigns the final result to y . If you're new to programming, this expression might seem a little weird. This shouldn't bother you as the compiler will understand what you're trying to do.

Compound Assignment

You can simplify the way you express an assignment by using a compound assignment operator.

In the previous example, we could've simply written:

See the table below on how you can use compound assignment operators.

Increment & Decrement Operators

If you have the compound assignment +=1 , you can simply write it as ++ . This is known as the "increment operator". Similarly, the decrement operator is -- .

Related: How to Write a for Loop in Java

When used before the operand, the increment and decrement operators are known as "prefix operators". And when used after the operand, they're called "postfix operators".

With prefix, the variable being operated on is first modified and then used while with postfix, the initial value before modification is used.

Generally, both postfix and prefix operators yield the same answer. It's only when dealing with large expressions that the answer may change.

Make Operators Work For You

It's important to note that increment and decrement operators only act on variables (e.g. x++ ) and not direct values (but not 5++ ). You should also not leave any whitespace while using increment and decrement operators, unlike with the operators before that. Doing so will give a compile-time error.

Always use parentheses when possible to logically group expressions. This will avoid unnecessary logic errors.

With these operators under your belt, understanding how to use access modifiers in Java will be a piece of cake.

The Java Tutorials have been written for JDK 8. Examples and practices described in this page don't take advantage of improvements introduced in later releases and might use technology no longer available. See Java Language Changes for a summary of updated language features in Java SE 9 and subsequent releases. See JDK Release Notes for information about new features, enhancements, and removed or deprecated options for all JDK releases.

Assignment, Arithmetic, and Unary Operators

The simple assignment operator.

One of the most common operators that you'll encounter is the simple assignment operator " = ". You saw this operator in the Bicycle class; it assigns the value on its right to the operand on its left:

This operator can also be used on objects to assign object references , as discussed in Creating Objects .

The Arithmetic Operators

The Java programming language provides operators that perform addition, subtraction, multiplication, and division. There's a good chance you'll recognize them by their counterparts in basic mathematics. The only symbol that might look new to you is " % ", which divides one operand by another and returns the remainder as its result.

The following program, ArithmeticDemo , tests the arithmetic operators.

This program prints the following:

You can also combine the arithmetic operators with the simple assignment operator to create compound assignments . For example, x+=1; and x=x+1; both increment the value of x by 1.

The + operator can also be used for concatenating (joining) two strings together, as shown in the following ConcatDemo program:

By the end of this program, the variable thirdString contains "This is a concatenated string.", which gets printed to standard output.

The Unary Operators

The unary operators require only one operand; they perform various operations such as incrementing/decrementing a value by one, negating an expression, or inverting the value of a boolean.

The following program, UnaryDemo , tests the unary operators:

The increment/decrement operators can be applied before (prefix) or after (postfix) the operand. The code result++; and ++result; will both end in result being incremented by one. The only difference is that the prefix version ( ++result ) evaluates to the incremented value, whereas the postfix version ( result++ ) evaluates to the original value. If you are just performing a simple increment/decrement, it doesn't really matter which version you choose. But if you use this operator in part of a larger expression, the one that you choose may make a significant difference.

The following program, PrePostDemo , illustrates the prefix/postfix unary increment operator:

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Operators constitute the basic building block of any programming language. Java too provides many types of operators which can be used according to the need to perform various calculations and functions, be it logical, arithmetic, relational, etc. They are classified based on the functionality they provide.

Types of Operators: 

• Arithmetic Operators
• Unary Operators
• Assignment Operator
• Relational Operators
• Logical Operators
• Ternary Operator
• Bitwise Operators
• Shift Operators

This article explains all that one needs to know regarding Assignment Operators. 

Assignment Operators

These operators are used to assign values to a variable. The left side operand of the assignment operator is a variable, and the right side operand of the assignment operator is a value. The value on the right side must be of the same data type of the operand on the left side. Otherwise, the compiler will raise an error. This means that the assignment operators have right to left associativity, i.e., the value given on the right-hand side of the operator is assigned to the variable on the left. Therefore, the right-hand side value must be declared before using it or should be a constant. The general format of the assignment operator is, 

Types of Assignment Operators in Java

The Assignment Operator is generally of two types. They are:

1. Simple Assignment Operator: The Simple Assignment Operator is used with the “=” sign where the left side consists of the operand and the right side consists of a value. The value of the right side must be of the same data type that has been defined on the left side.

2. Compound Assignment Operator: The Compound Operator is used where +,-,*, and / is used along with the = operator.

Let’s look at each of the assignment operators and how they operate: 

1. (=) operator: 

This is the most straightforward assignment operator, which is used to assign the value on the right to the variable on the left. This is the basic definition of an assignment operator and how it functions. 

Syntax:  

Example:  

2. (+=) operator: 

This operator is a compound of ‘+’ and ‘=’ operators. It operates by adding the current value of the variable on the left to the value on the right and then assigning the result to the operand on the left. 

Note: The compound assignment operator in Java performs implicit type casting. Let’s consider a scenario where x is an int variable with a value of 5. int x = 5; If you want to add the double value 4.5 to the integer variable x and print its value, there are two methods to achieve this: Method 1: x = x + 4.5 Method 2: x += 4.5 As per the previous example, you might think both of them are equal. But in reality, Method 1 will throw a runtime error stating the “i ncompatible types: possible lossy conversion from double to int “, Method 2 will run without any error and prints 9 as output.

Reason for the Above Calculation

Method 1 will result in a runtime error stating “incompatible types: possible lossy conversion from double to int.” The reason is that the addition of an int and a double results in a double value. Assigning this double value back to the int variable x requires an explicit type casting because it may result in a loss of precision. Without the explicit cast, the compiler throws an error. Method 2 will run without any error and print the value 9 as output. The compound assignment operator += performs an implicit type conversion, also known as an automatic narrowing primitive conversion from double to int . It is equivalent to x = (int) (x + 4.5) , where the result of the addition is explicitly cast to an int . The fractional part of the double value is truncated, and the resulting int value is assigned back to x . It is advisable to use Method 2 ( x += 4.5 ) to avoid runtime errors and to obtain the desired output.

Same automatic narrowing primitive conversion is applicable for other compound assignment operators as well, including -= , *= , /= , and %= .

3. (-=) operator: 

This operator is a compound of ‘-‘ and ‘=’ operators. It operates by subtracting the variable’s value on the right from the current value of the variable on the left and then assigning the result to the operand on the left. 

4. (*=) operator:

 This operator is a compound of ‘*’ and ‘=’ operators. It operates by multiplying the current value of the variable on the left to the value on the right and then assigning the result to the operand on the left. 

5. (/=) operator: 

This operator is a compound of ‘/’ and ‘=’ operators. It operates by dividing the current value of the variable on the left by the value on the right and then assigning the quotient to the operand on the left. 

6. (%=) operator: 

This operator is a compound of ‘%’ and ‘=’ operators. It operates by dividing the current value of the variable on the left by the value on the right and then assigning the remainder to the operand on the left. 

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Java Operators Quiz - MCQ - Multiple Choice Questions

In this blog post, we present a Java Operators quiz to test your knowledge and understanding of operators in the Java programming language. 

Operators play a crucial role in performing various operations on data, including arithmetic, assignment, logical operators, comparison, and more. Let's dive into the quiz questions and see how well you can tackle these challenges!

Learn and Master Java Programming:  Learn Java Programming with Examples

Check out 100+ quiz questions:  100+ Quiz Questions to Test Your Java, Spring Boot, Microservices, Hibernate, REST API Skills

The answer and explanation of each question have given at the end of this post.

1. Which operator is used for equality comparison in Java?

2. which operator is used for arithmetic addition in java , 3. what is the output of the following program, 4. which operator is used for performing logical and in java , 5. what is the output of the following program, 6. what is the output of the following program, 7. what is the output of the following program, 8. which operator is used to increment a variable by one in java , 9. which operator is used for performing string concatenation in java , answers and explanations.

Explanation:

The relational operator in Java is used to compare two values. The == operator is used to check if two values are equal or not.

The + operator is used for arithmetic addition in Java.

The postfix increment operator (x++) first assigns the value of x to y, and then increments the value of x. Therefore, the value of y is 10.

a) &&

The && operator is used for logical AND in Java.

The % operator is used for finding the remainder of the division operation. In this case, 5 divided by 2 leaves a remainder of 1.

a) x is greater

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Compound Assignment Operators

Source: (compoundassignment.java), related examples:.

Arithmetic Operators Compound Assignment Operators Concatenating Strings Conditional Operator Equality Operators Equality Reference Variables Equality and Relational Operators Increment Decrement Unary Operators Instanceof Comparison Logical Operators Logical Short Circuit Operator Precedence Examples Post Decrement Post Increment Pre Decrement Pre Increment Short Circuit Logical Operators Ternary Example

Java Examples | Operators | Compound Assignment Operators

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Posted under Operators and Control Statements Java Programming

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Q. Choose the Compound Assignment Arithmetic Operators in Java below.

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Java Arithmetic Operators Compound Assignment Operators

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Java Arithmetic Compound Assignment Operators can combine an arithmetic operation with an assignment.

For the following statement:

In Java, you can rewrite this statement as shown here:

This version uses the += compound assignment operator.

Both statements perform the same action: they increase the value of a by 4.

Here is another example,

which can be expressed as

In this case, the %= obtains the remainder of a /2 and puts that result back into a.

There are compound assignment operators for all of the arithmetic, binary operators.

Any statement of the form

can be rewritten as

The following code shows several op= assignments:

Home / Programming MCQs / JAVA MCQs / Question

Q. Choose the Compound Assignment Arithmetic Operators in Java below.

Correct answer: Option(D)

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