Symmetric Order

#include<stdio.h>
int main()
{
    int n,i,set=;
    char str[][];
    while(scanf("%d",&n)&&n!=)
    {
        for(i=;i<=n;i++)
        {
            scanf("%s",&str[i]);
        }
        printf("SET %d\n",set);
        set++;
        if(n%==)
        {
            for(i=;i<=n;)
            {
                printf("%s\n",str[i]);
                i=i+;
            }
            for(i=n;i>;)
            {
                printf("%s\n",str[i]);
                i=i-;
            }
        }
        else
        {
            for(i=;i<=n;)
            {
                printf("%s\n",str[i]);
                i=i+;
            }
            for(i=n-;i>;)
            {
                printf("%s\n",str[i]);
                i=i-;
            }
        }
    }
    return ;
}