Need a bit explanation!!

How does 2d matrix print to the output? i means if i got a[7][7]
Will it on the first line of the output from left to right or from top to bottom??
For example

Code:

---

int sum;
for (i=1; i <= 7; ++i) {
  for (j=1; j <= 7; ++j)
  ......
 }

---

i think output should be :
1 2 3 4 5 6 7
1 2 3 4 5 6 7
1 2 3 4 5 6 7
1 2 3 4 5 6 7
1 2 3 4 5 6 7
1 2 3 4 5 6 7
1 2 3 4 5 6 7

It prints left to right first or bottom all the 1 first then 2...thanks

Well it depends on if you are doing

Code:

---

matrix[i][j]

---

or

Code:

---

matrix[j][i]

---

Basically, it is your choice on how you represend the 2D array. There is no rule that i's represent rows, and j's represent columns :)

> i means if i got a[7][7]
Then the loop is
for (i=0; i < 7; ++i)

Not
for (i=1; i <= 7; ++i)

arrays start with 0.
an array of size 7 would have 7 elements.
thus there would be 7 valid indices: 0, 1, 2, 3, 4, 5, 6.
the highest valid index is array_size - 1

thus: yes, for (i=0; i < 7; ++i) is correct -
also correct would be for (i=0; i <= 6; ++i)

oo..ok..thanks for helping..