int* array = new int[N]; delete array 还是delete []array
时间: 2023-12-18 09:04:31 浏览: 89
在使用 new 运算符动态分配内存后,如果要释放这块内存,就需要使用 delete 运算符。但是,对于动态分配的数组,我们需要使用 delete[] 运算符来释放内存,而不是使用 delete 运算符。原因是,与 new[] 运算符相对应,delete[] 运算符可以正确地释放数组所占用的内存,包括数组中所有元素的内存,而 delete 运算符只会释放指向数组中第一个元素的指针所占用的内存,而不会释放数组中所有元素的内存。
因此,在使用 new[] 运算符分配数组内存时,应该使用 delete[] 运算符来释放内存,例如:
```cpp
int* array = new int[N];
// 使用数组
delete[] array; // 释放数组内存
```
需要注意的是,如果在使用 new[] 运算符分配数组内存时,使用了 delete 运算符来释放内存,会导致未定义的行为,可能会导致程序崩溃或内存泄漏等问题。因此,一定要注意使用正确的释放内存的方法。
相关问题
int *p = new int[10];
This code allocates memory on the heap for an integer array of size 10 and assigns the address of the first element to a pointer variable named 'p'. The pointer 'p' can be used to access individual elements of the array or to perform operations on the entire array.
It is important to note that since memory is allocated dynamically using the 'new' keyword, it must be deallocated manually using the 'delete[]' keyword when it is no longer needed. Failure to do so can result in memory leaks.
Here is an example of how to allocate and deallocate memory using the above code:
```c++
int *p = new int[10]; // allocate memory for 10 integers
// use the pointer to access and modify individual elements of the array
p[0] = 1;
p[1] = 2;
// ...
delete[] p; // deallocate memory when finished using it
```
int *a=new int[50]
This line of code creates a dynamic array of 50 integers and assigns a pointer to the first element of the array to the variable 'a'. The 'new' operator is used to allocate memory for the array on the heap, and the 'int' keyword specifies the data type of the elements in the array.
Since this is a dynamic array, the size of the array can be changed at runtime by using the 'delete' operator to deallocate the current array and then creating a new array with a different size using the 'new' operator. It is important to remember to deallocate the memory allocated by the 'new' operator using the 'delete' operator when the array is no longer needed to avoid memory leaks.
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