bool has = false;
foreach (int i in num)
{ if (i % 7 == 0) {has = true; break;} }
if (has)
Console.WriteLine("有7的整倍數");
else
Console.WriteLine("沒有7的整倍數");
int x = 9;
for (int i = 0; i <x; i++){
for (int j = 1; j < x+1; j++){
if (i==j-1 || i==x-j) {
Console.Write('0');
} else {
Console.Write('.');
}
}
Console.WriteLine();
}
