Linux下的C语言程序发生段错误，为什么呢？
#include <stdio.h>
#include <stdlib.h>
#include <string.h>
#define NMEMB 50
#define SIZE 10
int compar (const void *a, void *b)
{
return (strcmp((char *)a,(char *)b));
}
int main()
{
char data[NMEMB][SIZE]={"Linux","freebsd","solzris","sunos","windows"};
char key[80],*base,*offset;
int i,j, nmemb=NMEMB,size=SIZE;
for(i=1;i<5;i++)
{
fgets(key,sizeof(key),stdin);
key[strlen(key)-1]='\0';
base=data[0];
offset=(char*)lfind(key,base,&nmemb,size,compar);
if(offset == NULL)
{
printf("%s not found!\n",key);
//j++;
offset=(char*)lsearch(key,base,&nmemb,size,compar);
//printf("Add %s to data array\n",data+j);
printf("Add %s to data array\n",offset);
}
else
{
printf("found: %s\n",offset);
}
}
}
[wyq@localhost lfindbsearch]$ gcc lfind.c -o lfind
[wyq@localhost lfindbsearch]$ ./lfind
Linux
found: Linux
nihao
nihao not found!
Add 
to data array(怎么会有乱码？)
hello
hello not found!
Add hello to data array
Segmentation fault
为什么会发生段错误？
经过调试：
(gdb) r
Starting program: /home/wyq/Linux-C1/di3zhang/lfindbsearch/lfind
nihao
nihao not found!
Program received signal SIGSEGV, Segmentation fault.
0x00920e0b in strlen () from /lib/libc.so.6
(gdb) q
好像意思是strlen()的原因，可我觉得不是。。。
求解:谢谢.
[解决办法]
段错误 -- 非法使用内存，大部分是指针没有初始化或数组越界
[解决办法]
offset=(char*)lfind(key,base,&nmemb,size,compar);
应该是：offset=(char*)lfind(key,data,&nmemb,size,compar);吧
