Simple Operator question. +=

Question

So my friend gave me some source code to start out with so I could review and understand it and I have a question about it, but since he's not online I thought I would try here, mainly I don't quite understand this line.

num += i;

Essentially, this is the same as

num = num + i 

right?

If you need more details please tell me! I look forward to hearing your replies soon.

Answer 1

From ISO C++03 (Section 5.17/7)

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.