printf为什么要用%d啊，那是给int用的，用%f
by G111118 @ 2023-08-12 00:05:46
@[G111118](/user/774430)
i就是int类型呀，是用%d吧
by Morningstar01 @ 2023-08-12 10:30:51
```
#include <stdio.h>
#include<math.h>
int main()
{
double s, n=2.0,sum=2.0;
int i=1;
scanf("%lf", &s);
while(sum < s){
n *= 0.98;
sum += n;
i++;
}
printf("%d", i);
return 0;
}
```
by G111118 @ 2023-08-12 13:45:13
@[Morningstar01](/user/1054113)
为什么要用for循环
用while判断直到大于等于终点距离啊
by G111118 @ 2023-08-12 13:45:53
非要用for的话直接for(i=1;;i++)
by G111118 @ 2023-08-12 13:47:12
@[Morningstar01](/user/1054113)
```cpp
#include <iostream>
using namespace std;
int main()
{
long double a=2, sum=0, step=0, target;
cin >> target;
while(sum < target)
{
sum += a;
a = a/100*98;
step++;
}
cout << step;
return 0;
}
``````
by z_perfect @ 2023-08-15 15:24:58
应该能看懂吧
by z_perfect @ 2023-08-15 15:25:25