地震监测系统（简单实现）

#include <iostream>
#include <string>
#include <cmath>
#include <Windows.h>
#include <fstream>
using namespace std;
const double THRESHOLD=1.5;
double sy_check(double arr[],int length,int n)
{
    double XSqrt=0;
    for(int i=0;i<n;i++)
    {
        XSqrt+=pow(arr[length-i],2);
    }
    return XSqrt/n;
}
int main(void)
{
    string filename;
    ifstream fin;
    int num,long_window=0,weight_window=0;
    double time_cr=0,*sensor=NULL,weight_power=0,long_power=0;
    double ratio;
    cout<<"Please input your file name：";
    cin>>filename;
    fin.open(filename.c_str());
    if(fin.fail())
    {
        cout<<"Enter file of name"<<endl;
        exit(-1);
    }else
    {
        fin>>num>>time_cr;
        if(num>=0)
        {
            sensor=new double[num];
            for(int i=0;i<num;i++)
            {
                fin>>sensor[i];
            }
            cout<<"请输入长时间："<<endl;
            cin>>long_window;
            cout<<"请输入短时间："<<endl;
            cin>>weight_window;
            for(int i=long_window-1;i<num;i++)
            {
                long_power=sy_check(sensor,i,long_window);
                weight_power=sy_check(sensor,i,weight_window);
                ratio=weight_power/long_power;
                if(ratio>THRESHOLD)
                {
                    cout<<"Possible event at"<<time_cr*i<<"seconds\n";
                }
            }
            //这条语句要在for外面
            delete[] sensor;
        }
            fin.close();
    }
    system("pause");
    return 0;
}