代码如下：```cpp #include<bits/stdc++.h> using namespace std; int main() { int b,c,d; double a,e; cin>>a; b=a/100; c=(a-b100)/10; d=a-b100-c10; e=double(a-b100-c10-d); cout<<e10<<"."<<d<<c<<b<<endl; return 0; }