Sunspot data for the past 275 years or so has been collected in the file sunspot

Question

Sunspot data for the past 275 years or so has been collected in the file sunspots.dat The data in the file is organized into three columns as follows: the first column is a year number (int), the second column is a month number (int), and the third column is the average daily number of sunspots seen in that year/month (float). The very first line of the file contains a single integer, which identifies the number of data points in each of the three following columns Write a C++ program which will load each column of data in this file into three separate arrays: an int array called year, another int array called month, and a float array called spots. Your program should then analyze the data in these arrays and print the following information to the screen: 1.) The largest number of sunspots seen, and the year/month when this occurred; 2.) The average number of sunspots seen over the time range in the data.

Explanation / Answer

// C++ program to read a file and analyze the data

#include <iostream>

#include <fstream>

using namespace std;

// function declaration

int largest_sunspot(float [],int size);

float average_sunspot(float[] ,int [],int[], int size);

int main() {

               int points;

               ifstream fin("sunspots.dat"); // open the file

               // if file exists

               if(fin.is_open())

               {

                              fin>>points; // read the number of data points

                              // create array for year, month and sunspots

                              int year[points];

                              int month[points];

                              float sunspots[points];

                              int i=0;

                              // read the data points

                              while(!fin.eof())

                              {

                                             fin>>year[i]>>month[i]>>sunspots[i];

                                             i++;

                              }

                              // display the largest sunspot month and year and average number of sunspots in the time range

                              int index = largest_sunspot(sunspots,points);

                              cout<<" The largest sunspots : "<<sunspots[index]<<" occurred in month : "<<month[index]<<" Year : "<<year[index];

                              cout<<" Average number of sunspots seen :"<<average_sunspot(sunspots,year,month,points)<<endl;

               }else

                              cout<<" Unable to open file";

               fin.close();

               return 0;

}

// function to return the index of largest sunspot

int largest_sunspot(float sunspot[],int size)

{

               int max =0;

               for(int i=1;i<size;i++)

                              if(sunspot[i] > sunspot[max])

                                             max =i;

               return max;

}

// function to return the average sunspots in the time range

float average_sunspot(float sunspot[] ,int year[],int month[], int size)

{

               int year_min = year[0],year_max = year[0];

               float total_sunspots = 0;

               for(int i=0;i<size;i++)

               {

                              if(year[i] > year_max)

                                             year_max = year[i];

                              if(year[i] < year_min)

                                             year_min = year[i];

                              total_sunspots += sunspot[i];

               }

               return(total_sunspots/(year_max - year_min));

}

//end of program

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