题解 | #整数与IP地址间的转换#

#include <iostream>
using namespace std;

int main() {
    string str;
    long a, b, c, d;
    scanf("%d.%d.%d.%d", &a, &b, &c, &d);
    cout << ((a << 24) + (b << 16) + (c << 8) + d) << endl;
    long num;
    cin >> num;
    a = num >> 24;
    num -= a << 24;
    b =  num >> 16;
    num -= b<< 16;
    c = num >> 8;
    num -= c << 8;
    d = num;
    cout << a << "." << b << "." << c << "." << d << endl;
}
// 64 位输出请用 printf("%lld")