可怕的段错误 [英] The dreaded segfault

问题描述

大家好，


我正在尝试调试以下程序。调试核心文件

在

states = 36，labels = 40的值时，在possibleFlows [i] [k] [m] = 0时显示了segfault。它适用于较小的值。


可能是什么原因？整数溢出或内存不足？我是否b $ b缺少明显的东西？

我使用的是ubuntu和GNU g ++。


int main（）

{

const int states = 36，labels = 40;

int fromLabels = labels，toLabels = labels;

int fromStates = states，toStates = states;

int successors [fromStates] [toStates];

int stateMatrix [fromStates] [toStates] [fromLabels] [toLabels];

int possibleFlows [states] [fromLabels] [toLabels];

//将所有可能的流初始化为0

for（int i = 0; i<状态; i ++）

for（int k = 0; k< fromLabels; k ++）

for（int m = 0; m< toLabels; m ++）

possibleFlows [i] [k] [m] = 0; //这里的分段错误


//用给定值填充

// S0

possibleFlows [0] [1] [ 0] = 1;

possibleFlows [0] [2] [0] = 1;

................ ............剩余的

代码............................. .............................................................................................................................


我正在尝试调试以下程序。调试核心文件

在

states = 36，labels = 40的值时，在possibleFlows [i] [k] [m] = 0时显示了segfault。它适用于较小的值。


可能是什么原因？整数溢出或内存不足？我是否b $ b缺少明显的东西？

我使用的是ubuntu和GNU g ++。


int main（）

{

const int states = 36，labels = 40;

int fromLabels = labels，toLabels = labels;

int fromStates = states，toStates = states;

int successors [fromStates] [toStates];

这不是合法的C ++，你把它建成C吗？


-

Ian Collins

2008年10月15日星期三19:30:23 -0700（太平洋时间），Prasad

< pr * *********@gmail.com写道：

> int possibleFlows [states] [fromLabels] [toLabels];
//将所有可能的流初始化为0
for（int i = 0; i< states; i ++）
for（int k = 0; k< fromLabels; k ++）
for（int m = 0; m< toLabels; m ++）
possibleFlows [i] [k] [m] = 0; //分段错误这里

我的大脑受伤所以我可能错了，但你可能想尝试......


possibleFlows [m] [k] [i] = 0;


我总是混淆我的多维下标，所以也许你有

到。

10月15日9：39 * pm，Ian Collins< ian-n ... @ hotmail.comwrote：

Prasad写道：

嗨伙计们，

我正在尝试调试以下程序。 *调试核心文件

在

states = 36，labels = 40的值时，在possibleFlows [i] [k] [m] = 0时显示segfault。它适用于较小的值。

可能是什么原因？整数溢出或内存不足？我是否b $ b缺少明显的东西？

我使用的是ubuntu和GNU g ++。

int main（）

{

* * const int states = 36，labels = 40;

* * int fromLabels = labels，toLabels = labels;

* * int fromStates = states，toStates = states;

* * int successors [fromStates] [toStates];

这不是合法的C ++，你把它建成C吗？


-

Ian Collins

这是一个c ++程序。我删除了所有名称空间声明，

标题和其他与问题无关的代码。

Hi folks,

I am trying to debug the following program. Debugging the core file
revealed segfault at possibleFlows[i][k][m]=0 when values of
states=36, labels=40. It works fine for lesser values.

What could be the reason? Integer overflow or out of memory? Am i
missing something obvious?
I am using ubuntu and GNU g++.

int main()
{
const int states=36, labels=40;
int fromLabels=labels, toLabels=labels;
int fromStates=states, toStates=states;
int successors[fromStates][toStates];
int stateMatrix[fromStates][toStates][fromLabels][toLabels];
int possibleFlows[states][fromLabels][toLabels];
//Initialise all possible flows to 0
for(int i=0;i<states;i++)
for(int k=0;k<fromLabels;k++)
for(int m=0; m<toLabels;m++)
possibleFlows[i][k][m]=0; //Segmentation fault here

//Populate with given values
//S0
possibleFlows[0][1][0]=1;
possibleFlows[0][2][0]=1;
.........................rest of the
code....................................

解决方案

Prasad wrote:

Hi folks,

I am trying to debug the following program. Debugging the core file
revealed segfault at possibleFlows[i][k][m]=0 when values of
states=36, labels=40. It works fine for lesser values.

What could be the reason? Integer overflow or out of memory? Am i
missing something obvious?
I am using ubuntu and GNU g++.

int main()
{
const int states=36, labels=40;
int fromLabels=labels, toLabels=labels;
int fromStates=states, toStates=states;
int successors[fromStates][toStates];

This isn''t legal C++, are you build this as C?

--
Ian Collins

On Wed, 15 Oct 2008 19:30:23 -0700 (PDT), Prasad
<pr**********@gmail.comwrote:

> int possibleFlows[states][fromLabels][toLabels];
//Initialise all possible flows to 0
for(int i=0;i<states;i++)
for(int k=0;k<fromLabels;k++)
for(int m=0; m<toLabels;m++)
possibleFlows[i][k][m]=0; //Segmentation fault here

My brains hurting so I may be wrong, but you might want to try...

possibleFlows[m][k][i]=0;

I always mix up my multi-dimensional subscripting, so maybe you have
to.

On Oct 15, 9:39*pm, Ian Collins <[e-mail]:

Prasad wrote:

Hi folks,

I am trying to debug the following program. *Debugging the core file
revealed segfault at possibleFlows[i][k][m]=0 when values of
states=36, labels=40. It works fine for lesser values.

What could be the reason? Integer overflow or out of memory? Am i
missing something obvious?
I am using ubuntu and GNU g++.

int main()
{
* *const int states=36, labels=40;
* *int fromLabels=labels, toLabels=labels;
* *int fromStates=states, toStates=states;
* *int successors[fromStates][toStates];

This isn''t legal C++, are you build this as C?

--
Ian Collins

This is a c++ program. I have removed all the namespace declaration,
headers and other code which was not relevant to the problem.

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