什么是“new int（100）”，做？ [英] What does "new int(100)" do?

问题描述

可能重复：

是一个变量或函数

使用类似：

int *arr = new int(100);

它通过编译，但我知道这是错误的。应为

and it passes compile, but I knew this is wrong. It should be

int *arr = new int[100];

当我编写错误的时候，编译器认为是什么？

What does the compiler think it is when I wrote the wrong one?

推荐答案

第一行分配单个 int ，并将其初始化为 100 。将 int（100）视为构造函数调用。

The first line allocates a single int and initializes it to 100. Think of the int(100) as a constructor call.

由于这是一个标量分配，试图访问 arr [1] 或使用 delete [] 会导致未定义的行为。

Since this is a scalar allocation, trying to access arr[1] or to free the memory using delete[] would lead to undefined behaviour.

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