题解 | #整数与IP地址间的转换#
整数与IP地址间的转换
https://www.nowcoder.com/practice/66ca0e28f90c42a196afd78cc9c496ea
#include <iostream>
#include <cmath>
#include <string>
using namespace std;
int main() {
//ch的使用又让我长见识了
char ch;
string res_str;
long ip_num, res;
unsigned int n1, n2, n3, n4;
cin >> n1 >> ch >>n2>>ch>>n3>>ch>>n4;
cin>>ip_num;
res = n1*pow(2, 8*3) + n2*pow(2, 8*2)+ n3*pow(2, 8) + n4;
cout << res <<endl;
res_str += to_string((ip_num>>24)&0xff) + ".";
res_str += to_string((ip_num>>16)&0xff) + ".";
res_str += to_string((ip_num>>8)&0xff) + ".";
res_str += to_string(ip_num&0xff);
cout << res_str << endl;
}
// 64 位输出请用 printf("%lld")
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