Write a program reverse-order. cpp which asks the user to input two dates (earlier date then later date). The program should report the West basin elevation for all days in the interval in the reverse chronological order (from the later date to the earlier).

reverse-order.cpp

#include<iostream>

#include <fstream>

#include <cstdlib>

#include <climits>

#include <sstream>

using namespace std;

#include <vector>

int main()

{

  ifstream fin("Current_Reservoir_Levels.tsv");

  if (fin.fail())

  {//check whether file exists or not

      cerr << "File cannot be opened for reading." << endl;

      exit(1);

  }

  //declare two vectors

  vector<string> Date;

  vector<float> westElVec;

  string header;

  getline(fin, header); // read one line from the file

  string dateArr[365], date;

  double eastSt, eastEl, westSt, westEl;

  string date1, date2;

  cout << "Enter starting date: ";

  cin >> date1; // getting starting date from user

  cout << "Enter ending date: ";

  cin >> date2; // getting ending date from user

  int count = 0;

  while (fin >> date >> eastSt >> eastEl >> westSt >> westEl)

  {

      fin.ignore(INT_MAX, '\n'); //skips to the end of line,

      //get the record from file

      //check if data is between the start and end or not

      if (date1 <= date && date2 >= date)

      {//insert the data

          Date.push_back(date);

          westElVec.push_back( westEl);

          count++;

      }

  }

  //sort the data by date indecending order

  for (int i = 0; i < count; ++i)

  {

      for (int j = 0; j < count - i - 1; ++j)

      {

          // Comparing consecutive dates

          if (Date[j] < Date[j + 1])

          {

              swap West basin elevation

              //double twestElVec = westElVec[j];

              //westElVec[j] = westElVec[j + 1];

              //westElVec[j + 1] = twestElVec;

              //swap dates

              string tDate = Date[j];

              Date[j] = Date[j + 1];

              Date[j + 1] = tDate;              

          }

      }

  }  

  for (int i = 0; i < count; i++)

      cout << Date[i] << "\t" << westElVec[i] <<"ft"<< endl;

  fin.close();

  //system("pause");

return 0;

}

Explanation:

a variable of array type holds a reference of object

array are commonly used in computer program to organize data so that a related set of values

array are using zero base indexing it start with 0.

all component of array have same type, two different types doesn't use in single array

if array are store 10 quantities its index value varies from 0 to 9.

it stores 1st quantity value in index value 0 and this process will same till index value 9.