neighbors.c程序调试（多维数组）

Question

I'm currently writing a C program that finds the elements that are larger than all of their neighbors in a multidimensional array. So if my input is

3 2 9

13 7 6

1 5 8

It should print

9
13
8

However, it doesn't seem to be working :( I've run through it a couple of times and can't seem to find anything wrong with it, other than the possibility that I'm handling my arrays incorrectly. Do you guys have any suggestions?

Here is my current code. http://pastebin.com/sJBhQMjy

Thank you!

PS: On my pastebin link I said "two-dimensional array"-- this was a typo, I just meant multidimensional.

Answer 1

Your program does not work because your widening has no effect. You are assigning a local array [n+2][n+2] to a pass-by-value parameter, so the change has no effect.

Even if it did, the loops in the main would explore the wrong part of the widened array (the upper-left corner, as opposed to the center, where the real data is stored).

Finally, your innermost if compares a[i][j] to a[m][n] instead of a[m][p] .

Instead of widening the array, you should add more conditions to the innermost if of the neighbor function:

if(i>=0 && i<n && j>=0 && j<n && a[i][j]>a[m][p]) return FALSE;