从另一个数组值初始化数组大小
问题描述：
#include<iostream>
using namespace std;
const int vals[] = {0, 1, 2, 3, 4};
int newArray[ vals[2] ]; //"error: array bound is not an integer constant"
int main(){
return vals[2];
}
//returns 2 if erroneous line is removed
为什么不这项工作？
Why doesn't this work?
答
C ++编译器只能在编译时已知的大小分配的数组。如果你想分配可变大小一块内存，使用新运营商。
The C++ compiler can only allocate an array with a size known at compile time. If you want to allocated a variable size piece of memory, use the new operator.