[cpp]很基础的问题，请高手解答

[Science]

int i = 1;
int j = (++i) + (++i) + (++i);
cout << j << endl;
为什么j输出10？
 
int i = 1;
int j = (i++) + (i++) + (i++);
cout << j << endl;
为什么输出3？
 
以上都是在VC6+SP6环境
 
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