问题描述
我在快乐C.使生活的游戏,我被告知使用的typedef枚举并在可能的情况,所以我做了一个typedef 状态
来的信号是否细胞 DEAD
或 ALIVE
。
我做了持有的所有世代所有单板一个三维数组。
当我尝试使用数组作为函数的参数,它说错误:数组类型具有不完整的元素类型
。难道我做的typedef错了吗?你不能有用户定义类型的数组?
这里是我的code:
i'm making a game of life in C. I was told to use typedef and enum wherever possible, so I made a typedef state
to signal whether a cell is DEAD
or ALIVE
.I made a 3d array that holds all the boards in all generations.when I try to use the array as a parameter of a function, it says error: array type has incomplete element type
. Did I do the typedef wrong? Can you not have arrays of user defined types?Here's my code:
#include <stdio.h>
#include <stdlib.h>
typedef enum { DEAD, ALIVE } state;
void nextGeneration(state[][][], int, int, int);
int numberOfNeighbours(state[][][], int, int, int);
void printGeneration(state[][][], int, int, int);
int main(void)
{
FILE *filePath;
int boardHeight;
int boardWidth;
int requestedGenerations;
state board[100][10][10] = { DEAD };
int h;
int w;
if((filePath = fopen("file1", "r")) == NULL)
{
fprintf(stderr, "No such file.\n");
exit(1);
}
if(fscanf(filePath, "%d %d %d", &requestedGenerations, &boardHeight, &boardWidth) != 3)
{
fprintf(stderr, "File doesn't contain the number of requested generations or the board's size.\n");
exit(2);
}
for (h = 0; h < boardHeight; h++)
for(w = 0; w < boardWidth; w++)
fscanf(filePath, "%d", &board[0][h][w]);
while(requestedGenerations > 0)
{
nextGeneration(board, requestedGenerations--, boardHeight, boardWidth);
printGeneration(board, requestedGenerations, boardHeight, boardWidth);
}
}
void nextGeneration(state board[][][], int requestedGeneration, int boardHeight, int boardWidth)
{
int h;
int w;
int currentNumOfNeighbours;
for(h = 0; h < boardHeight; h++)
for(w = 0; w < boardHeight; w++)
{
currentNumOfNeighbours = numberOfNeighbours(board, requestedGeneration, h, w);
if(board[requestedGeneration][h][w] == ALIVE)
{
if(currentNumOfNeighbours == 2 || currentNumOfNeighbours == 3)
board[requestedGeneration + 1][h][w] == ALIVE;
} else if(currentNumOfNeighbours == 3)
board[requestedGeneration + 1][h][w] == ALIVE;
}
}
}
int numberOfNeighbours(state board[][][], int requestedGeneration, int h, int w)
{
int result = 0;
if(board[requestedGeneration][h][w + 1]) result++;
if(board[requestedGeneration][h][w - 1]) result++;
if(board[requestedGeneration][h + 1][w]) result++;
if(board[requestedGeneration][h - 1][w]) result++;
if(board[requestedGeneration][h + 1][w + 1]) result++;
if(board[requestedGeneration][h - 1][w + 1]) result++;
if(board[requestedGeneration][h + 1][w - 1]) result++;
if(board[requestedGeneration][h + 1][w - 1]) result++;
return result;
}
void printGeneration(state board[][][], int requestedGeneration, int boardHeight, int boardWidth)
{
int h;
int w;
for(h = 0; h < boardHeight; h++)
{
for(w = 0; w < boardWidth; w++)
printf("%d", board[requestedGeneration][h][w]);
printf("\n");
}
}
实际的错误消息:
Actual error messages:
program1.c:4: error: array type has incomplete element type
program1.c:5: error: array type has incomplete element type
program1.c:6: error: array type has incomplete element type
program1.c: In function ‘main’:
program1.c:31: error: type of formal parameter 1 is incomplete
program1.c:32: error: type of formal parameter 1 is incomplete
program1.c: At top level:
program1.c:35: error: array type has incomplete element type
program1.c: In function ‘nextGeneration’:
program1.c:43: error: type of formal parameter 1 is incomplete
program1.c: At top level:
program1.c:52: error: array type has incomplete element type
program1.c:65: error: array type has incomplete element type
任何帮助将是非常美联社preciated,谢谢。)
Any help would be much appreciated, thanks :).
推荐答案
您需要给规模持续在函数定义数组的两个维度,类似的东西,例如:
You need to give size to last two dimensions of array in function definition, something like that for example
#define y 10
#define z 10
void nextGeneration(state board[][y][z], int requestedGeneration, int boardHeight, int boardWidth)
{
....
}
int numberOfNeighbours(state board[][y][z], int requestedGeneration, int h, int w)
{
....
}
这是给系统提示如何计算,当您试图访问一个元素的索引。请记住,阵列(不管多少维度有)仅仅是一个连续的一块内存,所以当你索引阵列板[requestedGeneration] [H] [W]
编译器生成code一样,
That is to give the system a hint how to calculate the index of an element when you trying to access it. Remember that array (no matter how many dimensions it has) is just a continuous piece of memory, so when you index into your array board[requestedGeneration][h][w]
compiler generates code like that
*(board + requestedGeneration * 10 * 10 + h * 10 + w )
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