The code I wrote worked without any problem in OS X, but I got the following error when I ran it on VS 2013 community.

我写的代码在OS X中没有任何问题，但是当我在VS 2013社区上运行它时出现了以下错误。

Unhandled exception at 0x001A3D22 in Myproject.exe: 0xC0000005:
Access violation writing location 0x00000000.

Here is the code with problem. The original code has some more lines, but the code below generates the same error by itself.

这是有问题的代码。原始代码有更多行，但下面的代码本身会生成相同的错误。

#include <stdio.h>

int main(void){
    int **p;
    p = (int **)malloc(sizeof(int *) * 5000);
    for (int i = 0; i < 5000; i++)
        p[i] = (int *)malloc(sizeof(int) * 5000 * 25);

    for (int i = 0; i < 5000 * 25; i++) p[0][i] = 0;
    for (int i = 1; i < 5000; i++) p[i][0] = 0;      //<- error on this line

    printf("donw!\n");
    system("pause");
    return 0;
}

This is the status when error occured. i and p are colored as red.

这是发生错误时的状态。我和p的颜色为红色。

    name        value                         type
    i           4118                          int
    p           0x00758fe8 {0x0075de48 {0}}   int * *
    p[0]        0x0075de48 {0}                int *
    p[0][i]     0                             int
    p[i]        0x00000000 {???}              int *

Can anyone tell me what makes this kine of difference between OSX and Windows? In OSX I compiled the code with gcc.

任何人都可以告诉我是什么让OSX和Windows之间产生了这种差异？在OSX中，我用gcc编译了代码。

1 个解决方案

p = (int **)malloc(sizeof(int *) * 5000);
if ( p == NULL )
{
   // Deal with error.
}

for (int i = 0; i < 5000; i++)
{
   p[i] = (int *)malloc(sizeof(int) * 5000 * 25);
   if ( p[i] == NULL )
   {
      // Deal with error
   }
}