Though it’s nice to write readable code, one handy tool in the C language is an assignment operator. Even if you don’t use one, you need to be able to recognize it.
The following equation is quite common in programming:
a = a + n;
In C, you can abbreviate this statement by using an assignment operator:
a += n;
The operator goes before the equal sign. If it went afterward, it might change into a unary operator, which looks weird:
a =+ n;
So the value of variable a equals positive n? The compiler may buy that argument, but it’s not what you intended.
Also, don’t forget the increment and decrement operators, ++ and --, which are quite popular in loops.