如果函数成功,则返回值非零。
这个退出值不是0(零),如main函数中所返回的。
The exit value is not 0 (zero), as returned in function main.
现在这一类型的值可以通过内建的函数new来分配,这将返回一个指针,指向一块内存单元,其所占内存槽初始化为零。
Values of this type can now be allocated using the built-in function new, which returns a pointer to the value in memory with all slots initialized to the zero value.
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