Difference between “pointer to int” and “pointer to array of ints”

Question

int main()
{
    int (*x)[5];                 //pointer to an array of integers
    int y[6] = {1,2,3,4,5,6};    //array of integers
    int *z;                              


        

Answer 1

Hope this code helps:

int main() {

    int arr[5] = {4,5,6,7,8};        
    int (*pa)[5] = &arr;
    int *pi = arr;

    for(int i = 0; i< 5; i++) {
        printf("\n%d %d", arr[i], (*pa)[i]);    
    }

    printf("\n0x%x -- 0x%x", pi, pa);
    pi++;
    pa++;
    printf("\n0x%x -- 0x%x", pi, pa);
}

prints the following:

4 4
5 5
6 6
7 7
8 8
0x5fb0be70 -- 0x5fb0be70
0x5fb0be74 -- 0x5fb0be84 

UPDATE: You can notice that pointer to integer incremented by 4 bytes (size of 32 bit integer) whereas pointer to array of integer incremented by 20 bytes (size of int arr[5] i.e. size of 5 int of 32 bit each). This demonstrates the difference.