为了找到子在给定的文本。C PROGRAMM [英] To find the substring in a given text.. C programm

问题描述

char *substring(char *text, int position, int length)
{
   int i, j=0;
   char *temp ;

   for(i=position-1; i<position+length-1; i++)
   {
     temp[j++] = text[i];
   }
   temp[j] = '\0';

   return temp;
}

嗨什么是在以下code中的错误..我想在Fedora机上运行的..而它给我一个运行时错误分段故障。这是什么错误一回事..和为什么它给这个错误。

Hi What is the error in the following code.. I am trying to run this on Fedora Machine.. And its giving me a run-time error "Segmentation Fault". What is this error all about.. and why is it giving this error..

谢谢..

推荐答案

您需要为温度分配内存 - 目前它只是一个悬空指针。您可以使用的malloc 此，但请注意，来电者将需要确保这个存储随后免费 D。

You need to allocate memory for temp - currently it's just a dangling pointer. You can use malloc for this but note that the caller will need to ensure that this storage is subsequently freed.

例如：

char *substring(const char *text, int position, int length)
{
   char *temp = malloc(length + 1);
   int i, j;

   for (i = position, j = 0; i < position + length; i++, j++)
   {
       temp[j] = text[i];
   }
   temp[j] = '\0';

   return temp;
}

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