6-3

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

int main()
{
int n,xu,yu,cif,i,j,k;
printf("Unesite prirodan broj N: ");
xu=wherex();
yu=wherey();
do{
gotoxy(xu,yu);
printf("    ");
gotoxy(xu,yu);
n=0;
do{
do{
cif=getch();
}while(((cif<'0'||cif>'9')||(n==0&&cif=='0'))&&cif!=13);
if(cif!=13){
n=n*10+cif-48;
printf("%c",cif);
}
}while(cif!=13);
}while(n<5||n>25||n%2==0);
i=1;
for(i=1;i<=40-n/2;i++){
    clrscr();
    gotoxy(i,13+n/2);
    for(j=1;j<=n;j++)printf("*");
    xu=wherex()-1;
    yu=wherey();
    for(j=1;j<=n/2;j++){
        yu--;
        xu--;
        gotoxy(xu,yu);
        printf("*");
    }
    for(j=1;j<=n/2;j++){
        xu--;
        yu++;
        gotoxy(xu,yu);
        printf("*");
    }
    gotoxy(81-n-i,13-n/2);
    for(j=1;j<=n;j++)printf("*");
    xu=wherex()-1;
    yu=wherey();

    for(j=1;j<=n/2;j++){
        yu++;
        xu--;
        gotoxy(xu,yu);
        printf("*");
    }
    for(j=1;j<=n/2;j++){
        yu--;
        xu--;
        gotoxy(xu,yu);
        printf("*");
    }
    Sleep(50);
}

    gotoxy(40-n/2+2,13-n/2+1);
    xu=wherex();
    yu=wherey();

gotoxy(1,22);
getch();
return 0;
}