题目链接

https://www.nowcoder.com/acm/contest/85/A

思路

这个 就是 E

但是 运算的时候 要保证 其精度

AC代码

#include <cstdio>

#include <cstring>

#include <ctype.h>

#include <cstdlib>

#include <cmath>

#include <climits>

#include <ctime>

#include <iostream>

#include <algorithm>

#include <deque>

#include <vector>

#include <queue>

#include <string>

#include <map>

#include <stack>

#include <set>

#include <numeric>

#include <sstream>

#include <iomanip>

#include <limits>

using namespace std;

typedef long long ll;

typedef unsigned long long ull;

typedef pair <int, int> pii;

typedef pair <ll, ll> pll;

const double PI  = 3.14159265358979323846264338327;

const double E   = exp(1);

const double eps = 1e-6;

const int INF    = 0x3f3f3f3f;

const int maxn   = 1e5 + 5;

const int MOD    = 1e9 + 7;

int main()

{

    int t;

    cin >> t;

    while (t--)

    {

        double sum;

        int a, b, c;

        scanf("%d%d%d", &a, &b, &c);

        sum = pow(E, a);

        sum *= b;

        cout << setiosflags(ios::fixed) << setprecision(c) << sum <<endl;

    }

}