while(scanf("%d",&n)!=EOF)
2013-08-11 09:05
435 查看
scanf("%d,%d", &a, &b);
如果a和b都被成功读入，那么scanf的返回值就是2
如果只有a被成功读入，返回值为1
如果a和b都未被成功读入，返回值为0
如果遇到错误或遇到end of file，返回值为EOF。
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