There's a pretty good list and description here: http://en.wikipedia.org/wiki/Operators_in_C_and_C%2B%2B. Keep in mind this refers to C++ as well.
Many. Some of them: + ++ += & && &= Actually, 8 of them in number.
Are very important. Some of them are: + - * & ->
it is used to know the memory size of variable of data type. Ex: float a; printf ("sizeof (a)= %d\n", sizeof (a)); or: printf ("sizeof (float)= %d\n", sizeof (float));
exp1? exp2: exp3
arithmetic operator logic operatorincrement operatordecrement operatorconditional operator