compound assignment addition

Compound-Assignment Operators

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Compound-assignment operators provide a shorter syntax for assigning the result of an arithmetic or bitwise operator. They perform the operation on the two operands before assigning the result to the first operand.

Compound-Assignment Operators in Java

Java supports 11 compound-assignment operators:

Example Usage

To assign the result of an addition operation to a variable using the standard syntax:

But use a compound-assignment operator to effect the same outcome with the simpler syntax:

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C Compound Assignment

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The compound-assignment operators combine the simple-assignment operator with another binary operator. Compound-assignment operators perform the operation specified by the additional operator, then assign the result to the left operand. For example, a compound-assignment expression such as

expression1 += expression2

can be understood as

expression1 = expression1 + expression2

However, the compound-assignment expression is not equivalent to the expanded version because the compound-assignment expression evaluates expression1 only once, while the expanded version evaluates expression1 twice: in the addition operation and in the assignment operation.

The operands of a compound-assignment operator must be of integral or floating type. Each compound-assignment operator performs the conversions that the corresponding binary operator performs and restricts the types of its operands accordingly. The addition-assignment ( += ) and subtraction-assignment ( -= ) operators can also have a left operand of pointer type, in which case the right-hand operand must be of integral type. The result of a compound-assignment operation has the value and type of the left operand.

In this example, a bitwise-inclusive-AND operation is performed on n and MASK , and the result is assigned to n . The manifest constant MASK is defined with a #define preprocessor directive.

C Assignment Operators

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Compound assignment in C++

I would like to know the execution flow of compound assignments in C++. I came across a CodeChef question , where I am calculating NCR mod p values and adding them together to get the final answer:

This is happening because of integer overflow.

So, what is the execution sequence of compound assignment?

Let's say, if we have an equation a+=b%c then what would be the execution sequence:

assignment-operator
compound-assignment

Start from the innermost parentheses. In case of equally parenthesised operations, see the order of precedence. – eerorika Commented Jan 20, 2021 at 14:43
Just google cppreference operator precedence ? Compound assignment isn't special there. – underscore_d Commented Jan 20, 2021 at 14:59
I was not very confident. – Rahul Commented Jan 20, 2021 at 15:28

2 Answers 2

The compound assignment operators are in the second lowest precedence group of all in C++ (taking priority over only the comma operator). Thus, your a += b % c case would be equivalent to a += ( b % c ) , or a = a + ( b % c ) .

This explains why your two code snippets are different. The second:

is equivalent to:

Which is clearly different from the first (correct) expression:

This statement

is equivalent to the statement

As you can see it differs from the statement

From the C++ 14 Standard (5.18 Assignment and compound assignment operators)

7 The behavior of an expression of the form E1 op = E2 is equivalent to E1 = E1 op E2 except that E1 is evaluated only once. In += and -=, E1 shall either have arithmetic type or be a pointer to a possibly cv-qualified completely-defined object type. In all other cases, E1 shall have arithmetic type.

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Java Tutorial

Control statements, java object class, java inheritance, java polymorphism, java abstraction, java encapsulation, java oops misc.

In , assignment is used to assign values to a variable. In this section, we will discuss the .

The is the combination of more than one operator. It includes an assignment operator and arithmetic operator or bitwise operator. The specified operation is performed between the right operand and the left operand and the resultant assigned to the left operand. Generally, these operators are used to assign results in shorter syntax forms. In short, the compound assignment operator can be used in place of an assignment operator.

For example:

Let's write the above statements using the compound assignment operator.

Using both assignment operators generates the same result.

Java supports the following assignment operators:

Description	Example	Equivalent Expression
It assigns the result of the addition.	count += 1	count = count + 1
It assigns the result of the subtraction.	count -= 2	count = count - 2
It assigns the result of the multiplication.	price *= quantity	price = price * quantity
It assigns the result of the division.	average /= number_of_terms	average = number_of_terms
It assigns the result of the remainder of the division.	s %= 1000	s = s % 1000
It assigns the result of the signed left bit shift.	res <<= num	res = res << num
It assigns the result of the signed right bit shift.	y >>= 1	y = y >> 1
It assigns the result of the logical AND.	x &= 2	x = x & 2
It assigns the result of the logical XOR.	a ^= b	a = a ^ b
It assigns the result of the logical OR.	flag \|= true	flag = flag \| true
It assigns the result of the unsigned right bit shift.	p >>>= 4	p = p >>> 4

Using Compound Assignment Operator in a Java Program

CompoundAssignmentOperator.java

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cppreference.com

Assignment operators.















(C11)









Miscellaneous

General




(C11)







(C99)

Assignment and compound assignment operators are binary operators that modify the variable to their left using the value to their right.

Operator	Operator name	Example	Description	Equivalent of
=	basic assignment	a = b	becomes equal to
+=	addition assignment	a += b	becomes equal to the addition of and	a = a + b
-=	subtraction assignment	a -= b	becomes equal to the subtraction of from	a = a - b
*=	multiplication assignment	a *= b	becomes equal to the product of and	a = a * b
/=	division assignment	a /= b	becomes equal to the division of by	a = a / b
%=	modulo assignment	a %= b	becomes equal to the remainder of divided by	a = a % b
&=	bitwise AND assignment	a &= b	becomes equal to the bitwise AND of and	a = a & b
\|=	bitwise OR assignment	a \|= b	becomes equal to the bitwise OR of and	a = a \| b
^=	bitwise XOR assignment	a ^= b	becomes equal to the bitwise XOR of and	a = a ^ b
<<=	bitwise left shift assignment	a <<= b	becomes equal to left shifted by	a = a << b
>>=	bitwise right shift assignment	a >>= b	becomes equal to right shifted by	a = a >> b

Simple assignment Notes Compound assignment References See Also See also

[ edit ] Simple assignment

The simple assignment operator expressions have the form


lhs rhs

lhs	-	expression of any complete object type
rhs	-	expression of any type to lhs or with lhs

Assignment performs implicit conversion from the value of rhs to the type of lhs and then replaces the value in the object designated by lhs with the converted value of rhs .

Assignment also returns the same value as what was stored in lhs (so that expressions such as a = b = c are possible). The value category of the assignment operator is non-lvalue (so that expressions such as ( a = b ) = c are invalid).

rhs and lhs must satisfy one of the following:

both lhs and rhs have compatible struct or union type, or..
rhs must be implicitly convertible to lhs , which implies
both lhs and rhs have arithmetic types , in which case lhs may be volatile -qualified or atomic (since C11)
both lhs and rhs have pointer to compatible (ignoring qualifiers) types, or one of the pointers is a pointer to void, and the conversion would not add qualifiers to the pointed-to type. lhs may be volatile or restrict (since C99) -qualified or atomic (since C11) .
lhs is a (possibly qualified or atomic (since C11) ) pointer and rhs is a null pointer constant such as NULL or a nullptr_t value (since C23)

has type (possibly qualified or atomic(since C11)) _Bool and rhs is a pointer or a value(since C23)

(since C99)

has type (possibly qualified or atomic) and rhs has type

(since C23)

[ edit ] Notes

If rhs and lhs overlap in memory (e.g. they are members of the same union), the behavior is undefined unless the overlap is exact and the types are compatible .

Although arrays are not assignable, an array wrapped in a struct is assignable to another object of the same (or compatible) struct type.

The side effect of updating lhs is sequenced after the value computations, but not the side effects of lhs and rhs themselves and the evaluations of the operands are, as usual, unsequenced relative to each other (so the expressions such as i = ++ i ; are undefined)

Assignment strips extra range and precision from floating-point expressions (see FLT_EVAL_METHOD ).

In C++, assignment operators are lvalue expressions, not so in C.

[ edit ] Compound assignment

The compound assignment operator expressions have the form


lhs op rhs

op	-	one of *=, /= %=, += -=, <<=, >>=, &=, ^=, \|=
lhs, rhs	-	expressions with (where lhs may be qualified or atomic), except when op is += or -=, which also accept pointer types with the same restrictions as + and -

The expression lhs @= rhs is exactly the same as lhs = lhs @ ( rhs ) , except that lhs is evaluated only once.

If lhs has type, the operation behaves as a single atomic read-modify-write operation with memory order .

For integer atomic types, the compound assignment @= is equivalent to:

addr = &lhs; T2 val = rhs; T1 old = *addr; T1 new; do { new = old @ val } while (! (addr, &old, new);

(since C11)

[ edit ] References

C17 standard (ISO/IEC 9899:2018):
6.5.16 Assignment operators (p: 72-73)
C11 standard (ISO/IEC 9899:2011):
6.5.16 Assignment operators (p: 101-104)
C99 standard (ISO/IEC 9899:1999):
6.5.16 Assignment operators (p: 91-93)
C89/C90 standard (ISO/IEC 9899:1990):
3.3.16 Assignment operators

[ edit ] See Also

Operator precedence

Common operators

a = b a += b a -= b a *= b a /= b a %= b a &= b a \|= b a ^= b a <<= b a >>= b	++a --a a++ a--	+a -a a + b a - b a * b a / b a % b ~a a & b a \| b a ^ b a << b a >> b	!a a && b a \|\| b	a == b a != b a < b a > b a <= b a >= b	a[b] *a &a a->b a.b	a(...) a, b (type) a a ? b : c sizeof _Alignof (since C11)

[ edit ] See also

for Assignment operators

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[SOLVED] Compound Assignment With Augmented Addition (Help needed)

Tell us what’s happening: I’m so stuck on this, I really don’t know what to do

Your code so far

You’re gonna use the compound assignment operator += to add a number to a variable and assign it at the same time.

If you have

you can use += as a shorter version:

Thank You so much, do you also know how to do the subtraction bit? I’m confused var a = 11; var b = 9; var c = 3;

// Only modify code below this line

a -= a - 6; b -= b - 15; c -= c - 1; that’s what I have so far

It’s also the same idea/pattern with subtraction (and in general, operations that require two operands).

Is it the same for Multiplication and Division or is it another concept?

Can you tell what exactly confuses you?

This is what I came up with, for the multiplication

var a = 5; var b = 12; var c = 4.6;

a *= 25; b *= 36; c *= 46;

What am I doing wrong?

I’m very confused, I thought what I was doing was making it right

Thanks, I got how to do it. I really appreciate your help

The pattern of operating on a variable and assigning it back to that variable is so common that there’s a short-hand way of writing it.

Instead of writing a = a + 3 you can just write a += 3 . Same for all the other arithmetic operators. It’s just a different way of writing the same thing, but you only need to refer to the named variable once.

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Assignment Operators in Programming

Assignment operators in programming are symbols used to assign values to variables. They offer shorthand notations for performing arithmetic operations and updating variable values in a single step. These operators are fundamental in most programming languages and help streamline code while improving readability.

Table of Content

What are Assignment Operators?

Types of Assignment Operators
Assignment Operators in C
Assignment Operators in C++
Assignment Operators in Java
Assignment Operators in Python
Assignment Operators in C#
Assignment Operators in JavaScript
Application of Assignment Operators

Assignment operators are used in programming to assign values to variables. We use an assignment operator to store and update data within a program. They enable programmers to store data in variables and manipulate that data. The most common assignment operator is the equals sign ( = ), which assigns the value on the right side of the operator to the variable on the left side.

Types of Assignment Operators:

Simple Assignment Operator ( = )
Addition Assignment Operator ( += )
Subtraction Assignment Operator ( -= )
Multiplication Assignment Operator ( *= )
Division Assignment Operator ( /= )
Modulus Assignment Operator ( %= )

Below is a table summarizing common assignment operators along with their symbols, description, and examples:

Operator	Description	Examples
= (Assignment)	Assigns the value on the right to the variable on the left.	assigns the value 10 to the variable x.
+= (Addition Assignment)	Adds the value on the right to the current value of the variable on the left and assigns the result to the variable.	is equivalent to
-= (Subtraction Assignment)	Subtracts the value on the right from the current value of the variable on the left and assigns the result to the variable.	is equivalent to
*= (Multiplication Assignment)	Multiplies the current value of the variable on the left by the value on the right and assigns the result to the variable.	is equivalent to
/= (Division Assignment)	Divides the current value of the variable on the left by the value on the right and assigns the result to the variable.	is equivalent to
%= (Modulo Assignment)	Calculates the modulo of the current value of the variable on the left and the value on the right, then assigns the result to the variable.	is equivalent to

Assignment Operators in C:

Here are the implementation of Assignment Operator in C language:

Assignment Operators in C++:

Here are the implementation of Assignment Operator in C++ language:

Assignment Operators in Java:

Here are the implementation of Assignment Operator in java language:

Assignment Operators in Python:

Here are the implementation of Assignment Operator in python language:

Assignment Operators in C#:

Here are the implementation of Assignment Operator in C# language:

Assignment Operators in Javascript:

Here are the implementation of Assignment Operator in javascript language:

Application of Assignment Operators:

Variable Initialization : Setting initial values to variables during declaration.
Mathematical Operations : Combining arithmetic operations with assignment to update variable values.
Loop Control : Updating loop variables to control loop iterations.
Conditional Statements : Assigning different values based on conditions in conditional statements.
Function Return Values : Storing the return values of functions in variables.
Data Manipulation : Assigning values received from user input or retrieved from databases to variables.

Conclusion:

In conclusion, assignment operators in programming are essential tools for assigning values to variables and performing operations in a concise and efficient manner. They allow programmers to manipulate data and control the flow of their programs effectively. Understanding and using assignment operators correctly is fundamental to writing clear, efficient, and maintainable code in various programming languages.

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Addition assignment (+=)

The addition assignment ( += ) operator performs addition (which is either numeric addition or string concatenation) on the two operands and assigns the result to the left operand.

Description

x += y is equivalent to x = x + y , except that the expression x is only evaluated once.

Addition assignment using numbers

Other non-string, non-BigInt values are coerced to numbers:

Addition assignment using BigInts

Addition assignment using strings, specifications.

Specification

Browser compatibility

BCD tables only load in the browser with JavaScript enabled. Enable JavaScript to view data.

Assignment operators in the JS guide
Addition ( + )

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Compound assignment operators in Java
Compound-assignment operators provide a shorter syntax for assigning the result of an arithmetic or bitwise operator. They perform the operation on the two operands before assigning the result to the first operand. ... The following are all possible assignment operator in java: 1. += (compound addition assignment operator) 2. -= (compound ...
What Is a Compound-Assignment Operator?
Compound-Assignment Operators in Java. Java supports 11 compound-assignment operators: += assigns the result of the addition. -= assigns the result of the subtraction. *= assigns the result of the multiplication. /= assigns the result of the division. %= assigns the remainder of the division. &= assigns the result of the logical AND.
Assignment operators
Correct behavior. CWG 1527. C++11. for assignments to class type objects, the right operand could be an initializer list only when the assignment is defined by a user-defined assignment operator. removed user-defined assignment constraint. CWG 1538. C++11. E1 ={E2} was equivalent to E1 = T(E2) (T is the type of E1), this introduced a C-style cast.
C Compound Assignment
Each compound-assignment operator performs the conversions that the corresponding binary operator performs and restricts the types of its operands accordingly. The addition-assignment ( += ) and subtraction-assignment ( -= ) operators can also have a left operand of pointer type, in which case the right-hand operand must be of integral type.
PDF Compound assignment operators
The Java language specification says that: The compound assignment E1 op= E2 is equivalent to [i.e. is syntactic sugar for] E1 = (T) ((E1) op (E2)) where T is the type of E1, except that E1 is evaluated only once. We note two important points: The expression is cast to the type of E1 before the assignment is made (the cast is in red above) E1 ...
Compound Assignment With Augmented Addition.md
Compound Assignment With Augmented Addition. In programming, it is common to use assignments to modify the contents of a variable. Remember that everything to the right of the equals sign is evaluated first, so we can say: myVar = myVar + 5; to add 5 to myVar. Since this is such a common pattern, there are operators which do both a mathematical ...
Assignment Operators In C++
Compound Assignment Operators. In C++, the assignment operator can be combined into a single operator with some other operators to perform a combination of two operations in one single statement. These operators are called Compound Assignment Operators. There are 10 compound assignment operators in C++: Addition Assignment Operator ( += )
Assignment and Compound Assignment
The assignment statement stores a value in a variable. Compound assignment combines assignment with another operator. The value of the expression on the right hand side of the equal sign is stored in the variable, subscript element, or range on the left side. The old value of the variable, if any, is discarded, and the value of the expression ...
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Free Code Camp Material - To help you learn and walk-through step-by-step. JavaScript Algorithms and Data Structures SectionBasic Javascript Sub-Section Comp...
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6. The compound assignment operators are in the second lowest precedence group of all in C++ (taking priority over only the comma operator). Thus, your a += b % c case would be equivalent to a += ( b % c ), or a = a + ( b % c ). This explains why your two code snippets are different. The second:
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Compound operators, also called combined assignment operators, are a shorthand way to update the value of a variableThey are+= (addition)-= (subtraction)*= (...
Compound Assignment With Augmented Addition
Compound Assignment With Augmented Addition. In programming, it is common to use assignments to modify the contents of a variable. Remember that everything to the right of the equals sign is evaluated first, so we can say: myVar = myVar + 5; to add 5 to myVar. Since this is such a common pattern, there are operators which do both a mathematical ...
Compound Assignment Operator in Java
The compound assignment operator is the combination of more than one operator. It includes an assignment operator and arithmetic operator or bitwise operator. The specified operation is performed between the right operand and the left operand and the resultant assigned to the left operand. Generally, these operators are used to assign results ...
Augmented assignment
Augmented assignment (or compound assignment) is the name given to certain assignment operators in certain programming languages (especially those derived from C).An augmented assignment is generally used to replace a statement where an operator takes a variable as one of its arguments and then assigns the result back to the same variable. A simple example is x += 1 which is expanded to x = x + 1.
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Compound Assignment With Augmented Addition Hints Hint 1 Computers read from left to right. So, using the '+=' operator means that the variable is added with the right number, then the variable is assigned to the sum. Like so: var a = 9; a += 10; // Now, 'a' is equal to 19
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In this lesson we are learning about compound assignment and how to rewrite our code in shorter format to be more efficient and clear. For example (myVar = ...
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Let's understand all the compound assignment operators in Java with examples: 1. Addition and Assignment (+=) This operator adds the right-hand operand to the left-hand operand and assigns the result back to the left-hand operand. Example: int a = 5; a += 3; // a = a + 3; // Now 'a' is 8 2. Subtraction and Assignment (-=)
Assignment operators
Assignment and compound assignment operators are binary operators that modify the variable to their left using the value to their right. Operator Operator name Example Description Equivalent of = basic assignment a = b: a becomes equal to b: N/A + = addition assignment a + = b: a becomes equal to the addition of a and b: a = a + b-= subtraction ...
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The pattern of operating on a variable and assigning it back to that variable is so common that there's a short-hand way of writing it. Instead of writing a = a + 3 you can just write a += 3.Same for all the other arithmetic operators.
Assignment Operators in Programming
Assignment operators are used in programming to assign values to variables. We use an assignment operator to store and update data within a program. They enable programmers to store data in variables and manipulate that data. The most common assignment operator is the equals sign (=), which assigns the value on the right side of the operator to ...
Addition assignment (+=)
The addition assignment ( +=) operator performs addition (which is either numeric addition or string concatenation) on the two operands and assigns the result to the left operand. Try it. Syntax. js. x += y. Description. x += y is equivalent to x = x + y, except that the expression x is only evaluated once. Examples.