C ile Matrisin Köşegenlerine 1 Yapan Kod

//www.ethemsulan.com
#include <stdio.h>
#include <stdlib.h> 
int main(int argc, char *argv[])
{
    int i,j,n,z;
    int a[30][30],b[30];
    printf("n sayisi gir\n");
    scanf("%d",&n);
    for(i=0;i<n;i++)
    {
    b[i]=a[i][i];
    for(j=0;j<n;j++)
    {
    a[i][j]=a[i][j]/b[i];
    printf("\t");
    printf("%d",a[i][j]);
    }
    printf("\n");
}
  system("PAUSE");	
  return 0;
}