i++与++i

++[搜狗百科] //先用后加与先加后用

1 int a = 7;
2 int b = ++a; //int b = a += 1;
3 int c = a++; //int c = a; a++;
4 Console.WriteLine("{0} {1} {2}",a,b,c); //9 8 8
5 
6 int i = 1;
7 Console.WriteLine("{0} {1}",i++,i); //1 2

使用等价思维、反向推导验证等方法可以帮助你更深入理解~