hai in gcc compiler of fedora 14

int main()
{
int a=4;
printf("%d  %d  %d  %d",++a,++a,++a,++a);
return 0;
}
o/p  7 7 7 7

but if i replace ++a  with  a++ in above expn  i am getting o/p as  7 6 5 4

why ??  can u  explain ?????

thanks  in advance.......

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