```cpp
#include<iostream>
#include <iomanip>
using namespace std;
int main() {
int n,x,y;
cin>>n;
if(n<=150){
cout<<n*0.4463<<endl;}
if( n>150 && n<=400)
{x=n-150;
cout<<setiosflags(ios::fixed)<<setprecision(1)<<x*0.4663+66.945<<endl;}
if(n>400)
{y=n-400;
cout<<setiosflags(ios::fixed)<<setprecision(1)<<y*0.5663+183.52 <<endl;}
return 0;
}
```
by 空kong @ 2020-05-21 12:39:18
```
if(n<=150){
cout<<n*0.4463<<endl;}
```
保留一位小数呢？
by Trinitrotoluene @ 2020-05-21 12:40:27
@[木子马乔](/user/346355) 建议用printf函数；
需要cstdio头文件
保留一位小数的标准写法:
```cpp
printf("%.1lf",你想输出的数);
```
by k3v1n070828 @ 2020-05-21 12:43:57
感谢dalao
by 空kong @ 2020-05-21 12:48:35
```cpp
#include<bits/stdc++.h>
using namespace std;
int main(){
long long a;
long double b;
cin>>a;
if(a<=150){
b=a*0.4463;
}else if(a>=151&&a<=400){
b=150*0.4463+(a-150)*0.4663;
}else{
b=150*0.4463+250*0.4663+(a-400)*0.5663;
}
cout<<fixed<<setprecision(1)<<b;
return 0;
}
```
by zhouzhiyuan @ 2020-06-06 15:38:27