英文:
C++ Code with Global Dynamic Array Stops in the Sort Function
问题
我一直在尝试编写一个用户定义的数组，然后最终对其进行排序，但当代码达到排序函数时，代码最终停止。 代码如下：
#include <iostream>using namespace std;int array_size;int* array = new int[array_size];void create_array_cmd(){cout << "请键入所需的数组大小：";cin >> array_size;cout << "请输入您希望保存的数字字符：" << endl;for (int i = 0; i < array_size; i++){cout << "数组 [" << i + 1 << "]: ";cin >> ::array[i];}}void print_values_cmd(){cout << "这是您输入的值：" << endl;for (int i = 0; i < array_size; i++){cout << ::array[i] << " ";}cout << endl;}void array_sort_cmd(){cout << "排序后的值为：" << endl;for (int i = 1; i < array_size; i++){for (int j = i + 1; j < array_size; j++){int k = ::array[i];j = i - 1;while (j >= 0 && ::array[j] > k){::array[j + 1] = ::array[j];j = j - 1;}::array[j+1] = k;}}for (int i = 0; i < array_size; i++){cout << ::array[i] << " ";}}int main(){create_array_cmd();print_values_cmd();array_sort_cmd();}
此外，当我在主函数的最后添加以下内容：
delete array[];
代码将不再工作。不知何故，代码将正常工作，直到您输入多于2个值。
英文:
I've been trying to code a user-defined array then eventually sort it out but the code eventually stops when it reaches the sort function. The code is as follows:
#include <iostream>using namespace std;int array_size;int* array = new int[array_size];void create_array_cmd(){cout << "Please input your desired array size: ";cin >> array_size;cout << "Please key-in the numeric characters you wish to save: " << endl;for (int i = 0; i < array_size; i++){cout << "Array [" << i + 1 << "]: ";cin >> ::array[i];}}void print_values_cmd(){cout << "Here are the values you entered: " << endl;for (int i = 0; i < array_size; i++){cout << ::array[i] << " ";}cout << endl;}void array_sort_cmd(){cout << "The sorted values are: " << endl;for (int i = 1; i < array_size; i++){for (int j = i + 1; j < array_size; j++){int k = ::array[i];j = i - 1;while (j >= 0 && ::array[j] > k){::array[j + 1] = ::array[j];j = j - 1;}::array[j+1] = k;}}for (int i = 0; i < array_size; i++){cout << ::array[i] << " ";}}int main(){create_array_cmd();print_values_cmd();array_sort_cmd();}
Also, when I add
delete array[];
at the very end of the main function, the code won't work anymore. Somehow, the code will work fine until you input more than 2 values.
答案1
得分: 1
array 和 array_size 被声明为全局变量，并在开头进行初始化。因此，在尝试为 array 分配内存时，array_size 的值将为 0。
您可以在请求用户输入后分配内存，或者更好地使用 std::vector<int>。
英文:
array and array_size are declared as global variables and initialized at the beginning. So array_size will have value 0 when you are trying to allocate memory for array.
You can allocate memory after asking for user input or better still to use std::vector<int>
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