C Basics - Compound Assignment Operators in C

The following table shows all the compound or augmented assignment operators supported by the C language. Assume variable x holds 21, y holds 10 and variable z holds 0 then.

Operator Name	Syntax	Description	Meaning
Addition assignment	x += y	It adds the right operand to the left operand and assigns the result to the left operand.	x =x + y
Subtraction assignment	x -= y	It subtracts the right operand from the left operand and assigns the result to the left operand.	x =x - y
Multiplication assignment	x *= y	It multiplies the right operand with the left operand and assigns the result to the left operand.	x =x * y
Division assignment	x /= y	It divides the left operand with the right operand and assigns the result to the left operand.	x =x / y
Modulo assignment	x %= y	It takes modulus using two operands and assigns the result to the left operand.	x =x % y
Bitwise AND assignment	x &= y	Bitwise AND assignment operator.	x =x & y
Bitwise OR assignment	x |= y	Bitwise OR and assignment operator.	x =x | y
Bitwise XOR assignment	x ^= y	Bitwise exclusive OR and assignment operator.	x =x ^ y
Bitwise left shift assignment	x <<= y	Left shift and assignment operator.	x =x << y
Bitwise right shift assignment	x >>= y	Right shift and assignment operator.	x =x >> y

#include <stdio.h>

int main() 
{
 int x = 21;
 int y = 10;
 int z = 0;
 
 printf("Compound Assignment operators demo\n");
 printf("Value of x is %d\n", x );
        printf("Value of y is %d\n", y );
 printf("Value of z is %d\n", z );
 
 x += y;
 printf("Addition Assignment (x += y): %d\n", x );
 
 x = 21;
 x -= y;
 printf("Subtraction Assignment (x -= y): %d\n", x );
 
 x = 21;
 x *= y;
 printf("Multiplication Assignment (x *= y): %d\n", x );
 
 x = 21;
 x /= y;
 printf("Division Assignment (x /= y): %d\n", x );
 
 x = 21;
 x %= y;
 printf("Modulo Assignment (x mod= y): %d\n", x );
 
 x = 21;
 x <<= 2;
 printf("Bitwise left shift Assignment (x <<= 2): %d\n", x );
 
 x = 21;
 x >>= 2;
 printf("Bitwise right shift Assignment (x >>= 2): %d\n", x );
 
 x = 21;
 x &= y;
 printf("Bitwise AND Assignment (x &= y): %d\n", x );
 
 x = 21;
 x |= y;
 printf("Bitwise OR Assignment (x |= y): %d\n", x );
 
 x = 21;
 x ^= y;
 printf("Bitwise XOR Assignment (x ^= y): %d\n", x );
 return 0;
}

The output of the above program would be:

Compound Assignment operators demo
Value of x is 21
Value of y is 10
Value of z is 0
Addition Assignment (x += y): 31
Subtraction Assignment (x -= y): 11
Multiplication Assignment (x *= y): 210
Division Assignment (x /= y): 2
Modulo Assignment (x mod= y): 1
Bitwise left shift Assignment (x <<= 2): 84
Bitwise right shift Assignment (x >>= 2): 5
Bitwise AND Assignment (x &= y): 0
Bitwise OR Assignment (x |= y): 31
Bitwise XOR Assignment (x ^= y): 31

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Related topics:
Overview of Operators in C   |   Arithmetic Operators in C   |   Relational Operators in C   |   Logical Operators in C   |   Bitwise Operators in C   |   Conditional Operators in C   |   Miscellaneous Operators in C   |   Operator Precedence and Associativity in C

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List of topics: C Programming

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