What do these ( += , -= , *= , /= ) Operators Mean? [closed]

Answer 1

Roughly, var *operator*= expression means var = var *operator* expression. Also, I've heard there's a documentation somewhere.

Answer 2

It's a short form. So instead of writing:

x = x + 1;

You can simply write:

x += 1;

It has the same affect.

Answer 3

They are shorthand:

a += b

is the same as

a = a + b

Etc...

so

• a -= b is equivalent to a = a - b
• a *= b is equivalent to a = a * b
• a /= b is equivalent to a = a / b

As Kevin Brydon suggested - Familiarize yourself with the operators in C# here.

Answer 4

See 7.13 Assignment operators in the spec and its subsections., specifically 7.13.2 Compound assignment:

An operation of the form x op= y is processed by applying binary operator overload resolution (Section 7.2.4) as if the operation was written x op y. Then,

•If the return type of the selected operator is implicitly convertible to the type of x, the operation is evaluated as x = x op y, except that x is evaluated only once.

•Otherwise, if the selected operator is a predefined operator, if the return type of the selected operator is explicitly convertible to the type of x, and if y is implicitly convertible to the type of x, then the operation is evaluated as x = (T)(x op y), where T is the type of x, except that x is evaluated only once.

•Otherwise, the compound assignment is invalid, and a compile-time error occurs.

Answer 5

a+=1 means a = a+1
a-=2 means a = a-2
a*=3 means a = a*3
a/=4 means a = a/4

Answer 6

these are shorthand operators.
these are used when you does the operation & stores result into one of the variable between them. that is you store result into one of your operand suppose example
1)x=x+y;
here you can do x+=y;
ex 2) x=x+1;
here you can do x+=1;