所谓对称数是指从左到右和从右到左读该数，其值相同。例如，121和414都是对称数，而123不是对称数。

cout << "请输入正整数:";
cin >> n;
old_number = n;
new_number = 0;
while (n != 0) {
    new_number = new_number * 10 + n % 10;
    n /= 10;
}
if (old_number == new_number)
    cout << "对称数";
else
    cout << "非对称数";