Assignment operators in C++ are used to assign a value to a variable. The following are the assignment operators in C++:

1. Simple assignment (=): The simple assignment operator is used to assign a value to a variable.

Example:

int a = 10;

2. Addition assignment (+=): The addition assignment operator is used to add a value to a variable and then assign the result back to the variable.

Example:

int a = 5;
a += 10; // Equivalent to a = a + 10; a is now assigned the value 15

3. Subtraction assignment (-=): The subtraction assignment operator is used to subtract a value from a variable and then assign the result back to the variable.

Example:

int a = 10;
a -= 5; // Equivalent to a = a - 5; a is now assigned the value 5

4. Multiplication assignment (*=): The multiplication assignment operator is used to multiply a variable by a value and then assign the result back to the variable.

Example:

int a = 5;
a *= 10; // Equivalent to a = a * 10; a is now assigned the value 50

5. Division assignment (/=): The division assignment operator is used to divide a variable by a value and then assign the result back to the variable.

Example:

int a = 50;
a /= 10; // Equivalent to a = a / 10; a is now assigned the value 5

6. Modulus assignment (%=): The modulus assignment operator is used to calculate the remainder of a division operation between a variable and a value, and then assign the result back to the variable.

Example:

int a = 10;
a %= 3; // Equivalent to a = a % 3; a is now assigned the value 1

In summary, assignment operators in C++ are used to assign a value to a variable. The simple assignment operator (=) is used to assign a value, while the addition, subtraction, multiplication, division, and modulus assignment operators (+=, -=, *=, /=, and %=) are used to perform an operation on a variable and then assign the result back to the variable.