返回包含指向C中数组的指针的结构的函数

Question

First few parts of code:

    typedef struct
    {
        double sr, med;
        int **t;
    }wynik;

    wynik calc(int *t[], int size)
    {
        int i, *niep = NULL, j = 0, k = 1, sum = 0;
        int *sorted = (int*)malloc(size*sizeof(int));
        wynik out;
        //coping, sorting
        for (i = 0; i < size; i++)
            sorted[i] = (*t)[i];
        qsort(sorted, size, sizeof (**t), cmp);
        out.t = &sorted;
...
    return out;
    }

then in main():

wynik get = calc(&tab, tab_size);

Using debugger I discovered that in calc() out.t points to an array, but in main() get.t points to some weird things. How to fix it?

Answer 1

out.t contains the address of the local variable sorted . When the function returns, this address is no longer valid because the local variable went out of scope.

I see no reason here that out.t should be int** instead of int* . If you change it to be int* and just set its value with out.t = sorted , it should work correctly.