dos窗口中，一行应该是80个字符的位置
要是一行写不开，继续写就可以，不用按回车，程序自动换行
在c中，一行可以写多句话，如
t=a;a=b;b=t;
也可以一句话写多行，
如
char
yue[12][10]={"Januray
","February","March
","April",
"May
","June","July
","August","Septmber",
"October","November","December"}
;
这个都是允许的
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