Luogu brush questions C++ language | P1423 Xiaoyu is swimming

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【Description】

Xiaoyu was swimming happily, but soon she found sadly that she was not strong enough, and she was very tired from swimming. It is known that Xiaoyu can swim 2 meters in the first step, but as she becomes more and more tired and her strength becomes weaker and weaker, she can only swim 98% of the distance of the previous step in each next step. Now Xiaoyu wants to know   how many steps she needs to swim to reach a distance of s meters. Please program to solve this problem.

【enter】

Input a real number  s (unit: meter), indicating the target distance to swim.

【Output】

Output an integer, indicating how many steps Xiaoyu needs to swim in total.

【Input sample】

4.3

【Example of output】

3

【Code Explanation】

#include <bits/stdc++.h>
using namespace std;

int main()
{
    double n, len=0, step=2;
    int ans=0;
    cin >> n;
    while (len < n) {
        len += step;
        step *= 0.98;
        ans++;
    }
    cout << ans;
    return 0;
}

【operation result】

4.3
3