编程输出 100-999 之间所有满足下列条件的整数：这些数既是完全平方数,又有两位数字相同

100
121
144
225
400
441
484
676
900
public class Exercise
{
public static void main (String[] args)
{
for (int i = 100; i < 1000; i++ )
if (f (i))
System.out.println (i);
}
static boolean f (int n)
{
double d = Math.sqrt (n);
if ((int)d != d)
return false;
int a = n / 100, b = n / 10 % 10, c = n % 10;
if (a == b || a == c || b == c)
return true;
return false;
}
}