Code:
x = a;

The assignment operator can also be combined with a variety of other operators to provide shorthand versions of standard operations. It combines with the arithmetic operators +, -, *, / and % to give the following shorthand versions:

a += b    instead of   a = a + b
a -= b    instead of   a = a - b
a *= b    instead of   a = a * b
a /= b    instead of   a = a / b
a %= b    instead of   a = a % b

It also combines with the following bitwise operators:

a <<= b    instead of   a = a << b
a >>= b    instead of   a = a >> b
a >>>= b    instead of   a = a >>> b
a &= b    instead of   a = a & b
a ^= b    instead of   a = a ^ b
a |= b    instead of   a = a | b

NOTE:

If the operand to the left of the equal sign itself contains an assignment operator, then the above shorthand statements won't work. Instead you must use the longer version of the statement.