We want to write a swap_array function that swaps the values of the elements at indices i and j of an array t (we assume that i and j are valid indices). Among the following definitions, which one is the correct implementation of the swap function ?

Question

We want to write a  swap_array  function that swaps the values of the elements at indices  i  and  j  of an array  t  (we assume that  i  and  j  are valid indices). Among the following definitions, which one is the correct implementation of the  swap  function ?

Answer

void swap_array(int * t, int i, int j) {
    int * tmp = t + i;
    *(t + i) = *(t + j);
    *(t + j) = *tmp;
}

Answer

void swap_array(int * t, int * i, int * j) {
    int tmp = *t[i];
    *t[i] = *t[j];
    *t[j] = tmp;
}

Answer

void swap_array(int * t, int i, int j) {
    int tmp = t[i];
    t[i] = t[j];
    t[j] = tmp;
}

Answer

void swap_array(int * t, int i, int j) {
    int * tmp = &t[i];
    t[i] = t[j];
    t[j] = *tmp;
}

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