```b=int((b*10)+0.5)/10.0;```是什么意思
by WCX6936 @ 2023-10-13 20:11:22
你没有保留小数，代码为```cout<<fixed<<setprecision(n)<<b;//此题中n为1```
by WCX6936 @ 2023-10-13 20:15:58
还有
```
else if(a>400){
b=150*0.4463+250*0.4663+(a-400)*0.5663;
}
```
不需要if了，直接else
by WCX6936 @ 2023-10-13 20:18:53
[@shanyisang](https://www.luogu.com.cn/user/1110851#practice)
by WCX6936 @ 2023-10-13 20:19:51