6.3号 华为校招实习笔试题—ip转换

笔试第一题：ip转换

第一题：就是一个ip地址十进制转十六进制
输入：192.168.1.1
输出：C0.A8.1.1
思路：暴力法解决了这个问题，暂时没发现bug

#include <iostream>
#include <string>
#include <vector>
using namespace std;

char show[16] = { '0','1','2','3','4','5','6','7','8', '9','a','b','c', 'd','e','f' };
string t2h(string t)
{
	int num = 0;
	string result;
	int first = 0;
	int second = 0;
	int i = 0;

		for (int j = 0; j < t.size()+1; j++)
		{
			
			if (t[j] == '.' || t[j] == '\0' )
			{
				++i;
				first = num / 16;
				second = num % 16;
				if (first != 0)
				{
					result.push_back(show[first]);
					result.push_back(show[second]);
					if (i<=3)
						result.push_back('.');
				}
				else
				{
					result.push_back(show[second]);
					if (i <= 3)
					{
						result.push_back('.');
					}	
				}
				num = 0;
			}
			else
			{
				num = (t[j] - '0') + num * 10;
			}
		}
	return result;
}
int main(int argc, char* argv[])
{
	string s;
	cin >> s;

	if (s[0] == '.')
		return -1;
	string res = t2h(s);
	cout << "result is : " << res<< endl;
	system("pause");
	return 0;
}