printf("\na=%d,b=%d\n\n",a,b)中\n.

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printf("\na=%d,b=%d\n\n",a,b)中\n.printf("\na=%d,b=%d\n\n",a,b)中\n.printf("\na=%d,b=%d\n\n",a,b)中\n.\

printf("\na=%d,b=%d\n\n",a,b)中\n.
printf("\na=%d,b=%d\n\n",a,b)中\n.

printf("\na=%d,b=%d\n\n",a,b)中\n.
\n.\n\n这个代表输出很多的回车,换行的意思