题解 洛谷 P1553

字符串入门题，读入一行字符，先将第一个数读入翻转，读入下一个字符（如果没有则退出），再将下一个数读入翻转

#include<iostream>
#include<cstdio>
#include<cstring>
#include<sstream>
using namespace std;
void fan(unsigned long long n)
{
	if (n == 0) 
	{
		cout << 0;
		return;
	}
	while (n % 10 == 0) 
	    n /= 10;
	while (n != 0)
	{
		cout << n % 10;
		n /= 10;
	}
}
int main()
{
	string s;
	cin >> s;
	stringstream ss(s);
	unsigned long long n;
	ss >> n;
	fan(n);
	char ch;
	if (ss >> ch)
	{
		if (ch == '.') 
		{
			cout << ".";
			unsigned long long t;
			ss >> t;
			fan(t);
		}
		if (ch == '/') 
		{
			cout << "/";
			unsigned long long t;
			ss >> t;
			fan(t);
		}
		if (ch == '%') 
		{
			cout << "%";
		}
	}
	return 0;
}