作为一个概述,我试图在C中创建一个类似战舰的游戏,船只被放置在一个场地上。
这是我得到的错误:
==11147== Invalid write of size 8
==11147== at 0x400786: MakeField (battleship.c:34)
==11147== Address 0x8 is not stack'd, malloc'd or (recently) free'd
以下是相关代码:
struct piece{
int x;
int y;
int direction;
int length;
char name;
};
struct node{
struct piece boat;
struct node *next;
};
struct field{
int numBoats;
struct node *array[numRows];
};
struct field *MakeField(void){
struct field *f = NULL;
struct node *temp = NULL;
for(int i = 0; i < numRows; i++){
f->array[i] = temp; <--- VALGRIND ERROR HERE
}
f->count = 0;
return f;
}
任何人都可以帮忙解决这个问题吗?
答案 0 :(得分:1)
你正在取消引用一个NULL
poitner,你需要把你的指针指向某个地方并且某个地方有效,就像这样
struct field *f = malloc(sizeof(struct field));
if (f == NULL)
return NULL;
/* ... continue your MakeField() function as it is */
不要忘记调用者函数中的free(f)
。
顺便说一句,valgrind正在告诉你
Address 0x8 is not stack'd, malloc'd or (recently) free'd
~~~^~~~