算法之位运算整数与IP地址间的转换

 

分析和思路：直接位运算即可

 

#include <iostream>
using namespace std;

int main()
{
    long long int a,b,c,d;
    long long int num;

    while(scanf("%lld.%lld.%lld.%lld",&a,&b,&c,&d)!=EOF){
        cin>>num;
        cout<<(a<<24)+(b<<16)+(c<<8)+d<<endl;
        a = num>>24;
        num = num-(a<<24);
        b = num>>16;
        num = num-(b<<16);
        c = num>>8;
        d = num-(c<<8);
        cout<<a<<"."<<b<<"."<<c<<"."<<d<<endl;
    }
}