Strange processing!!

Hi All,
This is Anuj,an MCA std from India.
I tried the following 2 progs, both resulted in
different outputs. But i don't understand the REASON
behind them. 

1. 
int a=5, b = ++a + ++a + ++a;
printf("%d",b);
OUTPUT :- 21

2.
int a=5, b;
b = ++a + ++a + ++a;
printf("%d",b);
OUTPUT :- 54

Even if i use Macro expansion instead of writing the
whole expression, even then the result is same.
If anyone out there can help me out it'll be a big
help.Thank you.


		
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