```cpp
long long a;
cin>>a;
cout<<a;
```
by LV06 @ 2022-01-04 16:37:59
去掉小数部分即可
by LV06 @ 2022-01-04 16:38:59
@[清涟呀](/user/462941)
by LV06 @ 2022-01-04 16:39:06
@[QAQ__QWQ](/user/558597) 如果我想在源代码基础上更改需要怎么样?
by 清涟呀 @ 2022-01-04 16:44:00
@[清涟呀](/user/462941)
用double,题目说给出一个float变量,但实际上float精度可能不够。
by Terrible @ 2022-01-04 16:49:53
@[Terrible](/user/195942) 也不对
by 清涟呀 @ 2022-01-04 17:17:43
@[清涟呀](/user/462941)
```cpp
double x;
cin>>x;
cout<<(long long)x;
```
这样差不多
by LV06 @ 2022-01-04 17:22:24
@[清涟呀](/user/462941) 注意浮点数误差可能会使您输出 `-0`。
如输入 `-0.001`,您将输出 `-0` 这显然是不对的,要解决这个问题,只需将取整函数强制转换成整形即可。
```
cout << (long long)floor(a);
```
上取整同理。
by Qiaoqia @ 2022-01-04 17:36:17
~~更正规的强制转换写法~~
```cpp
std::static_cast<long long>(floor(a))
```
by Qiaoqia @ 2022-01-04 17:41:39