`double` 类型能用 `++`？
by _venti @ 2024-01-29 19:22:07
还有第四行是中文逗号
by _venti @ 2024-01-29 19:23:05
1.循环条件应为 x>0
2.更新 x 时用 "-" 而不是 "/"
3.ans不用开 `double`
by pig1121 @ 2024-01-29 19:23:33
@[babamunui](/user/762062) 你这a要初始化！要初始化成 **double a = 0;**
```cpp
#include <bits/stdc++.h>
using namespace std;
int main () {
double a = 0,x,s=2;
cin>>x;
while(x<1){
x/=s;
s*=0.98;
a++;
}
cout<<a;
return 0;
}
```
而且，你没有换行的习惯吗（）
by ZZYX_18670145320 @ 2024-01-29 19:24:18
谢谢各位大佬
by babamunui @ 2024-01-29 19:27:17
```cpp
#include <bits/stdc++.h>
using namespace std;
int main () {
double x,s=2;
long long a=0;
cin>>x;
while(!(x<1)){
x/=s;
s*=0.98;
a++;
}
cout<<a;
return 0;
}
```
by babamunui @ 2024-01-29 19:33:08
@[ZZYX_18670145320](/user/1192648) 是这样改吗
by babamunui @ 2024-01-29 19:36:35
@[babamunui](/user/762062) 是这样：（结合了其他大佬的想法）
```cpp
#include <bits/stdc++.h>
using namespace std;
int main () {
double x,s=2;
long long a=0;
cin>>x;
while(x>0){
x-=s;
s*=0.98;
a++;
}
cout<<a;
return 0;
}
```
循环条件是x > 0,然后每次循环就要减，就是x -= s。其他的问题就没什么。应该可以AC100。
by ZZYX_18670145320 @ 2024-01-29 20:59:36
谢谢
by babamunui @ 2024-01-30 07:48:28