Question

I was wondering if I could get some help on the last program I need to complete for an engineering C++ class. It is a very simple program however there is one part of the problem stumping me. Here is the problem statement

. Write a C++ program that reads in from a file two month names, followed by the rainfall amounts for each month in that span of months. These rain amounts are totaled, and then an average for each month in the span of months is calculated. Because the program does not know how many months of rainfall data there is, it must read and process data values until the end of file is encountered. The data for this program can be found in the Rainfall.txt file, which is located in on Blackboard

Below is the file data. As you can see it is extremely simple however I cannot for the life of me figure out how to make the program distinguish between strings and numeric data to sort into respective arrays. I have tried 2d arrays, Two 1D arrays, the peek function, getline functions and a multitude of other approaches.

April
August
1.16 2.02 1.34 1.51 .30

Answer 1

/* C++ Program to read the month and amount of rainfall from a file.
Then input two month names and then the rain fall amount of these span of month is totaled
and then average is computed and the printed.*/
#include<iostream>
#include<fstream>
#include<string>

using namespace std;

int main()
   {
   string month[12];
   string startmonth,endmonth;
   double rain[12];
   double sum=0.00;
   ifstream fin;
   //open the input file
   fin.open("Rainfall.txt",ios::in);
   if(fin.fail())
       {
       cout<<"unable to open file.";
       exit(0);
       }
  
   int i=0;
   //read the month names with amount of rain fall and store in two array month[] and rain[]
   while(!fin.eof())
       {
       fin>>month[i]   ;
       fin>>rain[i];
       i++;
       }
   //user input
   cout<<endl<<"Enter start month : ";
   cin>>startmonth;
   cout<<endl<<"Enter end month : ";
   cin>>endmonth;
  
   //find index of start month
   int start=0;
   while(month[start]!=startmonth)
       start++;
  
   //find index of end month
   int end=0;
   while(month[end]!=endmonth)
       end++;
      
   int numOfMonth=0;
   //compute ths sum of rainfalls in the span of two months
   if(start<=end)
       {
       for(i=start;i<=end;i++)
           {
           sum=sum+rain[i];
           numOfMonth++;
           }
       }
   else
       {
       for(i=start;i<12;i++)
           {
           sum=sum+rain[i];
           numOfMonth++;
           }
       for(i=0;i<=end;i++)
           {
           sum=sum+rain[i];
           numOfMonth++;
           }
       }
  
   //compute average rainfall
   double average=sum/numOfMonth;
   //print
   cout<<endl<<"Total number of Month: "   <<numOfMonth;
   cout<<endl<<"Total Rain falls : "   <<sum;
   cout<<endl<<"Average Rain falls : "   <<average;
   return 0;
   }

//---------------------------------------------------------------------------------------------------------------------------------

Input File(Rainfalls.txt)

January   0.50
February   0.20
March   0.90
April   1.16
May   2.02
June   1.34  
July   1.51
August   .30
September   1.50  
October   .80
November   1.00
December   .50

----------------------------------------------------------------

output

---------------------------------------------

CATurboC+ Diski TurboC31BINIHomeworkLib Rainfall.exe Enter start monthApril nter end month August Total number of Month: 5 Total Rain falls 6.33 Average Rain falls 1.266 Process exited after 5.99 seconds with return value 0 Press any key to continue - . - CTurboC++\Disk TurboC31BIN HomeworkLib Rainfall.exe Enter start nonthAugust nter end month : March Total number of Month:8 Total Rain falls 5.7 Average Rain falls :0.7125 Process exited after 7.155 seconds with return value 0 Press any key to continue - - -