遍历不同的数组C

Question

int array512[512], array1024[1024], array2048[2048], array4096[4096],  array8192[8192], array16384[16384];
int n512, n1024, n2048, n4096, n8192, n16384;

So I have a function call that looks like this:

(*f)(array512, n512);

But I want my program to iterate the function call with all of those arrays and the corresponding integer defined above. The integers are the corresponding arrays' sizes.

I tried to find some solutions. Is it possible to use "pointers" to iterate the function call with different variables?

Answer 1

This rough draft of an approach uses an array of struct , its members performing the role that your discrete function pointer arguments did. My hope here is that this may illustrate what some of the comments are suggesting:

Note, because this example uses an array of struct, your function pointer:

(*f)(array512, n512);  

will look like:

int (*f_ptr)(STRUCT_ARRAY *arr);  

See comments inline for explanations...

   typedef enum {
        N512 = 512,
        N1024 = 1024,
        /// and so on
        N16384 = 16384,
        N_MAX// bookkeeping - use N_MAX to create array sizes
    }SIZE;

int s_array[N_MAX] = {512, 1024, /* ...,*/ 16384};  



 typedef struct {
    int *arr;
    int arrSize;
}STRUCT_ARRAY;

typedef int (*f_ptr)(STRUCT_ARRAY *arr);
f_ptr f_array[N_MAX];

// prototypes of functions  
int f_1(STRUCT_ARRAY *arr);
int f_2(STRUCT_ARRAY *arr);
// and so on...
int f_n(STRUCT_ARRAY *arr);

STRUCT_ARRAY *array_t;
int main(void)
{
    f_array[0] = &f_1;
    array_t = calloc(N_MAX, sizeof(*array_t));//memory for struct
   // check for success here
    for(int i=0; i<N_MAX; i++)
    {
        //call your function using array[i], and s_array[i] for arguments
        array_t[i].arr = calloc(s_array[i], sizeof(int));
        f_array[i](&array_t[i]);
        // use it as needed
    }
    //free allocated memory memory

    return 0;
}

int f_1(STRUCT_ARRAY *arr)
{
    // this is 1 of N_MAX "definitions" that your array of function pointers will point to.
    //(create the others)
    // you will need to populate with the code as per your requirements
    // including allocating and freeing memory as needed.

    return 0;   
}

Note, if memory will be created in your function as well, then will need to be freed when no longer needed.