error C2105: '++' needs l-value

I've compiled the following program in VC++ environment. I've got an error "error C2105: '++' needs l-value" in line 6. Why am I getting this error? What is l-value? Why am I not getting the same error in line 5?



#include <iostream.h>
void main()
{
int i=2;
++++i; --------line 5
i++++; --------line 6
cout<<i;
}





Thank You,

Sincerely,
Uday

++++ Isn't a C++ operator. use ++.
i++;
++i;

an l-value is the value to the left of an expression; normally a variable name.

in case you wanted to increment it twice by doing that just use

i+=2;

I think it has to do with binding.

perhaps five evaluates as (++(++i)) and six evaluates as (i++(++))

Just another reason why ++i is better than i++. Also, even if it worked, there would be a subtle logic error in that postfix, postincrement ++ returns the previous values of i and then increments, whereas the prefix, preincrement ++i returns the new value of i. If you use either as the only statement in a line, there is no problem, but if you try to use it in conjuntion with anything else, you get problems.

Quote:

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Just another reason why ++i is better than i++.

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How can one be better then the other? Each has its own implementation..

>++++i; --------line 5
>i++++; --------line 6

GCC gives errors at both lines, so I think it's compiler specific. I know that it shouldn't, but unfortunately, most compilers don't implement the standard.

Since i is a variable and not an address, this error occurs.