c++ - Traversing a multi array with pointers -

for ( j = 0; j < d1; j++ ){      m += j;         ( = 0; < d1*d2; +=d2){         cout << *(m+i);         }     cout << endl; }

d1,d2 array dimensions

and

int* m = new int [d1*d2];

i want traverse on array , group , print columns.can't figure what's wrong code.seems working fine untill 3rd iteration in following example:

let's input values 1 2 3 4 5 6 7 8 9

i get:

1 4 7  2 5 8  4 7 (something random)

m += j;

you first incrementing m 0, one, 2. if took copy

int *start = m;

then in first iteration of outer loop, we'd have

m == start

in second,

m == start + 1

in third

m == start + 3

you'd want m == start + 2 there. except want keep m in order delete @ end, shouldn't change m @ use like

for ( j = 0; j < d2; j++ ){          ( = j; < d1*d2; +=d2){         cout << *(m+i);         }     cout << endl; }

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