NQueen Problem

#include<stdio.h>
int x[20], n, k = 1;
void nqueens();
void main() {
int i, j;
clrscr();
printf("\n Enter the no of queens");
scanf("%d", &n);
nqueens();
if (k > n)
{
printf("\n queen placement on board :\n");
for (i = 1; i <= n; i++)
{
for (j = 1; j <= n; j++)
{
if (j == x[i])
printf("Q%d\t", i);
else
printf("*\t");
}
printf("\n");
}
}

else
printf("\n queen can not be placed");
getch();
}

void nqueens() {
int i;
while (k <= n && k >= 0)
{
x[k] += 1;
for (i = 1; i < k && x[k] <= n; i++)
if ((x[i] == x[k]) || (abs(x[i] - x[k]) == abs(i - k)))
{
x[k] += 1;
i = 0;
}
if (x[k] > n)
--k;
else {
k++;
x[k] = 0;
}
}
}