C中的动态数组导致分段错误 [英] Dynamic array in C cause segmentation fault

问题描述

我以这种方式定义了一个动态数组：

I have defined a dynamic array this way:

double   *n_data ;
int n_data_c = 0, n_cnt = 0;
n_data_c = count_lines_of_file("abnorm");
n_data = (double *)malloc(n_data_c * sizeof(double));

我会循环计算距离，并这样做：

in a loop I calculate distance and do so:

n_cnt++;
n_data[n_cnt] = distance;

但它在此处返回 segmentation fault ： code> n_data [n_cnt] =距离；

but it returns segmentation fault here : n_data[n_cnt] = distance;

我想知道自己做错了什么。

I want to know if I'm doing something wrong.

推荐答案

检查返回的malloc，如果返回0，则失败。我认为，您的n_cnt更可能超出范围。如果它为负数或大于或等于n_data_c，则将出现段错误。

Check what malloc returned, if it returned 0, then it failed. More likely, I think, is your n_cnt is out of bounds. If it's negative, or greater than or equal to n_data_c, then you'll get a segfault.

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