Code2

#include <stdio.h>
#include <stdlib.h>
#include <stdbool.h>
int x[8]; /* x[i] = x coordinate of queen in row i. */
/* prints field */
void print ()
{
  int i,j;
  printf ("+-----------------------+\n");
  for (i=0; i<8; i++) {
    printf ("|");
    for (j=0; j<8; j++)
      if (j==x[i]) printf ("Q.|");
      else printf (" |");
    printf ("\n");
    printf ("+-----------------------+\n");
  }
  printf ("\n");
}
/* tests, whether (ix, iy) is beaten by queens 0...(iy-1) */
bool is_free (int ix, int iy)
{
  int i;
  for (i=0; i<iy; i++)
    if ((x[i]==ix) || (abs(x[i]-ix)==abs(i-iy)))
      return false;
  return true;
}
/* tries to place queen n on row n */
void placequeen (int n)
{
  int i;
  if (n==8)
    print();
  else
    for (i=0; i<8; i++)
      if (is_free(i,n)) {
        x[n]=i;
        placequeen (n+1);
      }
}
int main ()
{
  placequeen (0);
  return 0;
}