英文:
2D memory allocation
问题
我正在尝试修改我的程序，
我遇到的问题实际上是字符串数组的分配。
尝试运行以下程序时，我遇到了以下错误 -
#include <iostream>#include <cstdlib>using namespace std;void function_manipulate(unsigned int **arr_str, unsigned int *arr_len){*arr_len = 3;int len = *arr_len;// *arr_str = (unsigned char *)malloc(sizeof(unsigned char *)*(*arr_len));*arr_str = new unsigned int *[len];for (int i = 0; i < len; i++){cout << (*arr_str)[i] << '\n';}}int main(){unsigned int *array_string = NULL;unsigned int array_length = 0;function_manipulate(&array_string, &array_length);}
输出结果如下：
000
英文:
I am trying to modify my program,
The prblem I am running into is actually the array of string allocation.
When trying to run the below program, I am getting the below error -
#include <iostream>#include <cstdlib>using namespace std;void function_manipulate(unsigned int **arr_str, unsigned int *arr_len){*arr_len = 3;int len = *arr_len;// *arr_str = (unsigned char *)malloc(sizeof(unsigned char *)*(*arr_len));arr_str = new unsigned int *[len];for (int i = 0; i < len; i++){cout << arr_str[i] <<'\n';}}int main(){unsigned int *array_string = NULL;unsigned int array_length = 0;function_manipulate(&array_string, &array_length);}
The output looks like:
000
答案1
得分: 0
我认为这是您试图做的事情。
#include <iostream>#include <cstdlib>using namespace std;void function_manipulate(unsigned int **arr_str, unsigned int& arr_len){arr_len = 3;int len = arr_len;*arr_str = new unsigned int [len];for (int i = 0; i < len; i++){(*arr_str)[i] = 1234;}}int main(){unsigned int *array_string = NULL;unsigned int array_length = 0;function_manipulate(&array_string, array_length);if (array_string != NULL){cout << "array_length now is " << array_length << endl;for (int i = 0; i < array_length; i++){cout << array_string[i] << '\n';}delete[] array_string;}return 0;}
请注意，这段代码相当丑陋，我不建议这样做，但是它确实可以工作。
英文:
I think this is what you are trying to do.
#include <iostream>#include <cstdlib>using namespace std;void function_manipulate(unsigned int **arr_str, unsigned int& arr_len){arr_len = 3;int len = arr_len;// *arr_str = (unsigned char *)malloc(sizeof(unsigned char *)*(*arr_len));*arr_str = new unsigned int [len];for (int i = 0; i < len; i++){(*arr_str)[i] = 1234;//cout << arr_str[i] <<'\n';}}int main(){unsigned int *array_string = NULL;unsigned int array_length = 0;function_manipulate(&array_string, array_length);if (array_string != NULL){cout << "array_length now is " << array_length << endl;for (int i = 0; i < array_length; i++){cout << array_string[i] <<'\n';}delete[] array_string;}return 0;}
Note that this is pretty ugly and I would not recommend it. But it can be done.
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