为什么都要进行（char*）转换，意义是什么？

char getmonth( int n )
{
switch(n)
{
case 1: return (char)"January";
case 2: return (char*)"February";
case 3: return (char*)"March";
case 4: return (char*)"April";
case 5: return (char*)"May";
case 6: return (char*)"June";
case 7: return (char*)"July";
case 8: return (char*)"August";
case 9: return (char*)"September";
case 10: return (char*)"October";
case 11: return (char*)"November";
case 12: return (char*)"December";
default: return NULL;
}
}

因为字符串的存储方式类似于数组，如果想访问的话一般访问数组的基地址即可，后面的元素用一个步长就可以轻松获取

返回值要匹配啊，字符串属于常量，const char*