Problem in loop. Please Help. Urgent!

The code below will print out:

Row: 0, Col: 0, p: 0, m: 0
Row: 0, Col: 1, p: 0, m: 0
Row: 0, Col: 2, p: 0, m: 0

Row: 1, Col: 0, p: 0, m: 0
Row: 1, Col: 1, p: 0, m: 0
Row: 1, Col: 2, p: 0, m: 0

Row: 2, Col: 0, p: 0, m: 0
Row: 2, Col: 1, p: 0, m: 0
Row: 2, Col: 2, p: 0, m: 0

Row: 0, Col: 3, p: 3, m: 0
Row: 0, Col: 4, p: 3, m: 0
Row: 0, Col: 5, p: 5, m: 0
Row: 0, Col: 6, p: 5, m: 0
Row: 0, Col: 7, p: 5, m: 0

etc.

Can someone please let me know why p suddenly changes to 5 (everything is fine before that). This is really annoying me and has to be sorted tonight.

Thanks in advance.

Code:

---

int row, col, n, m, p, q;
  Cellgroup cgroup;
  Coord co;
  m = 0;
  p = 0;
  q = 0;
  n = 0;


while(m<=6) {
      while(p<=6) {
          for(row=m; row<m+3; row++) {
              for(col=p; col<p+3; col++) {
                  co.r = row;
                  co.c = col;
                  cgroup.grp[q] = co;
                  q++;
                  printf("Row: %d, Col: %d, p: %d, m: %d\n",row, col, p, m);
              }
              printf("\n");
          }
          group[n] = cgroup;
          n++;
          p+=3;
      }
      p=0;
      m+=3;
  }

---

remove Cellgroup and coord, the program runs ok with VC++ 6.0 compiler. Maybe there is a buffer overflow in Cellgroup.grp array that is trashing memory.

Thanks that helped. But the thing is I am only meant to be using one global variable - group.

I noticed it will work if you only take Cellgroup out of the method and leave Coord, however is there anyway you know of that I could keep both within the method?

post the Cellgroup structure. How big is the grp array? It should be something like this. Note that grp array must be at least 82, because the values of q range from 0 to 81.

Code:

---

struct Coord
{
        int r,c;
};

struct Cellgroup
{
        Coord grp[82];
};

---

Oh yeh, i never noticed that before. thanks