题解 | 复读机

#include <cstddef>
#include <cstdio>
#include <iostream>
#include <string>
using namespace std;

int main() {
    string a;
    while(cin >> a){
        size_t pos = a.find(".");
        if(pos != string::npos && a.length() > pos +1){
            double num = stod(a);
            printf("%0.1f\n",num);
        }else
            cout << a << endl;
    }
}
// 64 位输出请用 printf("%lld")