以下程序的输出结果是
main()
{inta,i;a=0;
for(i=1;i<5;i++)
{switch(i)
{case0:
case3:a+=2;
case1:
case2:a+=3;
default:a+=5;
}
}printf("%d\n",a);
}
A campus emergency ______ occur at any time of the day or night, weekend, or holiday, with little or no warning.
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