nested for loops

Hi, i'm trying to implement an algorithm using multidimensional arrays (matrices), structs and nested for loops. i would like to scan the matrix continously in order to manipulate the variables assigned to the struct members. I added an outer for loop to do this but it doesn't seem to work. any suggestions on how i might do this will be appreciated. portion of code is listed below:

/* This program creates a multidimension matrix representing a
2D array of nodes. Each array element represents a coordinate
in the 2D space. values of array elements signify node IDs
with the array elements being their coordinates.value's zero of the
array elements signify no nodes - just space.
The program attempts to implement an algorithm that scans the matrix
to gather node positions(coordinates)
*/

#include<stdio.h>
#include<stdlib.h>
#include<math.h>

//define structure

struct coord {
int x;
int y;
int xfirsthopneighbour;
int xsecondhopneighbour;
int active;
int anchornodestatus;
};

//declare and initialize array matrix

int array[4][4] = {{0,0,0,2},{0,1,0,0},{0,5,3,0},{4,0,0,0}};

// function prototype and global variable define

int performaveraging(struct coord *t);
int a,b;
int i = 20;

int main()
{

struct coord node[5];
node[0].x = 0;
node[0].active = 0;
node[0].xfirsthopneighbour = 5;
node[0].xsecondhopneighbour = 3;
node[0].anchornodestatus = 0;
node[1].x = 3;
node[1].active = 1;
node[1].xfirsthopneighbour = 1;
node[1].xsecondhopneighbour = 3;
node[1].anchornodestatus = 1;
node[2].x = 0;
node[2].active = 0;
node[2].xfirsthopneighbour = 2;
node[2].xsecondhopneighbour = 1;
node[2].anchornodestatus = 0;
node[3].x = 0;
node[3].active = 1;
node[3].xfirsthopneighbour = 5;
node[3].xsecondhopneighbour = 1;
node[3].anchornodestatus = 1;
node[4].x = 0;
node[4].active = 0;
node[4].xfirsthopneighbour = 4;
node[4].xsecondhopneighbour = 1;
node[4].anchornodestatus = 0;

for(i=0;i<20;i++) //this loop is my concern
{


for(a=0;a<4;a++)
{
for(b=0;b<4;b++)
{
if((array[a][b]) != 0)
{


// if neighbour is anchor or active acquire and store its coordinates

if(node[(node[array[a][b]-1].xfirsthopneighbour)-1].anchornodestatus == 1 ||
node[(node[array[a][b]-1].xfirsthopneighbour)-1].active == 1 &&
node[array[a][b]-1].active == 0)
{
node[array[a][b]-1].x = node[(node[array[a][b]-1].xfirsthopneighbour)-1].x;

node[array[a][b]-1].active = 1;

}

}

}
return 0;
}
return 0;
}

Code:

---

 
              for(a=0;a<4;a++)
              {
                        for(b=0;b<4;b++)
                        {
                                if((array[a][b]) != 0)
                                {
                                                                 
 
                // if neighbour is anchor or active acquire and store its coordinates
                                 
                                        if(node[(node[array[a][b]-1].xfirsthopneighbour)-1].anchornodestatus == 1 ||
                                      node[(node[array[a][b]-1].xfirsthopneighbour)-1].active == 1 &&
                                          node[array[a][b]-1].active == 0)
                                  {
                                          node[array[a][b]-1].x = node[(node[array[a][b]-1].xfirsthopneighbour)-1].x;
                                         
                                          node[array[a][b]-1].active = 1;
 
                                  }
                                 
                  }
         
          }
          return 0;

---

I believe this return will return control to the calling function. As the function is main, control is moved back to the OS.

Just remove it and all should work.

it works now, thanx