洛谷题目 P1553
// https://www.luogu.com.cn/problem/P1553#include <iostream>
#include <string>
using namespace std;
string reverse(string s)
{
int i;
string a = "";
for (i = s.size() - 1; i >= 0; i--)
a += s;
return a;
}
int count_zero_front(string s)
{
int i = 0, j;
for (j = 0; j < s.size(); j++)
{
if (s == '0')
i++;
else
break;
}
return i;
}
int count_zero_end(string s)
{
int i = 0, j;
for (j = (s.size() - 1); j >= 0; j--)
{
if (s == '0')
i++;
else
break;
}
return i;
}
int main()
{
string a;
getline(cin, a);
if (a.find('.') != string::npos)
{
int pos = a.find('.');
string t = reverse(a.substr(0, pos));
string s = reverse(a.substr(pos + 1, a.size() - 1));
t.erase(0, count_zero_front(t));
s.erase((s.size() - count_zero_end(s)), count_zero_end(s));
cout << ((t != "") ? t : "0") << "." << ((s != "") ? s : "0");
}
else if (a.find('/') != string::npos)
{
int pos = a.find('/');
string t = reverse(a.substr(0, pos));
string s = reverse(a.substr(pos + 1, a.size() - 1));
t.erase(0, count_zero_front(t));
s.erase(0, count_zero_front(s));
cout << ((t != "") ? t : "0") << "/" << ((s != "") ? s : "0");
}
else if (a.find('%') != string::npos)
{
int pos = a.find('%');
string t = reverse(a);
t.erase(0, 1);
t.erase(0, count_zero_front(t));
cout << ((t != "") ? t : "0") << "%";
}
else
{
string t = reverse(a);
t.erase(0, count_zero_front(t));
cout << ((t != "") ? t : "0");
}
return 0;
}
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