为什么我在以下代码中遇到运行时错误(SIGSEGV):
#include<stdio.h>
#include<string.h>
int main()
{
int t_line,count[10000],i;
scanf("%d",&t_line);
for(i=1;i<=t_line;i++)
{
fflush(stdin);
gets(t);
count[i]=(int)t[0]+(int)t[1]+(int)t[2];
}
for(i=1;i<=t_line;i++)
printf("%d\n",count[i]);
return 0;
}
我还试图通过初始化数组的所有元素来解决这个问题。
答案 0 :(得分:1)
我想知道如何编译代码,而不声明变量t
。但是,仍然唯一缺少的元素是:char t[your choice of size];
。除此之外
#include<stdio.h>
//#include<string.h> No need of this header,a s you are not using any string functions
int main()
{
int t_line,count[10000],i;
char t[64];//you need to declare the variable before using it
scanf("%d",&t_line);
//Its safer if you check this
if(t_line >= 10000)//if you use 0 and < t_line in for loop below then change the condition to: if(t_line > 10000)
{
printf("ERROR: Limit exceeded. Not enough memory.\n");
return 1;//or you could use exit(1); and #include <stdlib.h>
}
for(i=1;i<=t_line;i++)//suggested: for(i=0;i<t_line;i++)
{
//fflush(stdin);
//gets(t);
char *rc = fgets(t, sizeof(t), stdin);
if(rc != NULL)
{ t[strlen(t) - 1] = '\0';\\because fgets gets the \n into the string too. This line makes fgets similar to gets, improving safety from overflow.
}
else
{
// handle fgets failed error
}
count[i]=(int)t[0]+(int)t[1]+(int)t[2];
}
for(i=1;i<=t_line;i++)//suggested: for(i=0;i<t_line;i++)
printf("%d\n",count[i]);
return 0;
}
找到解决方案并建议内联更改为代码注释。
在C中,最好使用从0开始的索引,除非有特定要求使用其他值。