二维阵列存储器映射C.

Question

I have a 2d array and a pointer which points to its first element:

int s[100][100];
int* p; 

after reading some value and saving in s:

p=&s[0][0]

Well, now I want to print s elements, by accessing it through p:

for (x = 0; x<m; x++)
{
    for (y = 0; y<n; y++)
    {
        printf("%d ", *(p + sizeof(int)*x*n + y));
    }
    printf("\n");
}

which m is the number of rows and n is the number of columns. But... It gives me wrong answer. I guess the expression 'p + sizeof(int)*x*n + y' is causing the problem. Please help me correct it. Thanks.

Answer 1

You don't need the sizeof(int) - pointer arithmetic takes care of element size automatically - change:

p + sizeof(int)*x*n + y

to:

p + x*n + y

Answer 2

There are couple of errors. The first one was pointed out by Paul K. The second one is that you will have to use:

    printf("%d ", *(p + x*100 + y));

instead of

    printf("%d ", *(p + x*n + y));

Otherwise, you will be picking up the numbers from the wrong row.