如何在C中传递函数多维char数组？

Question

This is my code and it is not working. It generate these errors when I pass char array like this grid[r][c]

[Error] use of parameter 'r' outside function body

[Error] use of parameter 'c' outside function body

It generate these errors when I pass char array like this grid[][c]

[Error] use of parameter 'c' outside function body

It generate these errors when I pass char array like this grid[][]

[Error] declaration of 'grid' as multidimensional array must have bounds for all dimensions except the first 

And it runs perfectly fine when I pass this like this grid[1][2] ie just passing with an integer.0

I am stuck here and I don't know what to do or what not??

How to get rid of this problem?? Help Me !!!

Thanks in Advance!

void dfs(int r, int c, int pacman_r, int pacman_c, int food_r, int food_c, char grid[r][c]) {
    //logic here
}
int main(void) {
    int r, c;
    int pacman_r, pacman_c;
    int food_r, food_c;
    scanf( "%d %d", &pacman_r, &pacman_c);
    scanf( "%d %d", &food_r, &food_c);
    scanf( "%d %d", &r, &c);
    char grid[r][c];
    for( int i=0; i<r; i++) {
        scanf("%s[^\\n]%*c", grid[i]);
    }
    dfs( r, c, pacman_r, pacman_c, food_r, food_c, grid);
    return 0;
}

Answer 1

you should pass the argument as a char* then work with it as a pointer to a flattened instance of your array

void fn(char* grid, int c){
    printf("%c", (grid+n*c)[m]);
}

this will print `grid[n][m]