Thread: passing array of struct to function

Hi,
I'm trying to make array of struct and I don't get where is my mistake.
can you help me please?

This is the code:

Code:

typedef struct{
    int i_index;
    int j_index;
    int value;
}index_s;

int index_sum(int** arr, int rows, int cols, index_s** ans_arr){
    int i;
    int j;
    int ans = 0;
    int arr_i = 0;

    for(i=0; i<rows; i++){
        for(j=0; j<cols; j++){
            if ((i+j) == arr[i][j]){
                ans++;
            }
        }
    }
    
    *ans_arr = (index_s*)malloc(ans*sizeof(index_s));

    for(i=0; i<rows; i++){
        for(j=0; j<cols; j++){
            if((i+j) == arr[i][j]){
                ans_arr[arr_i]->i_index = i;
                ans_arr[arr_i]->j_index = j;
                ans_arr[arr_i]->value = arr[i][j];
                arr_i++;
            }
        }
    }

    return ans;
}

void third_main(){
    int** arr;
    index_s* ans_arr;
    int rows, cols;
    int num_of_sums;
    

    printf("Enter number of rows: ");
    scanf("%d",&rows);
    printf("Enter number of cols: ");
    scanf("%d",&cols);
    
    arr = alloc_matrix(rows, cols);

    num_of_sums = index_sum(arr, rows, cols, &ans_arr);
    printf("i=%d\t j=%d\t value=%d\n", ans_arr->i_index, ans_arr->j_index, ans_arr->value);
}

Thank you