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Possible Duplicate:
Why doesn't a+++++b work in C?
3 Plus between two variables in c
I tried searching for this but couldn't find any results.
A code with c=a+++++b fails to compile (gcc) whereas for c=a++ + ++b, it compiles successfully. c=a+++ ++b also works. c=a++ +++b fails.
Why is the whitespace making such a difference here? Or am i missing an important concept of C?
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No, the compiler doesn't differentiate between the two in output. The only difference is in parsing and possibly in lexical analysis (depending on expansion). You would generally use the shortcut form += .
For example, a += b is equivalent to a = a + b. '-=': This operator first subtracts the right operand from left operand and then assign the result to left operand. For example, a -= b is equivalent to a = a – b.
Since ++ is a token, the parser interprets a+++++b the same as a ++ ++ + b, which is not the same as a ++ + ++ b!
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