Passing infile values??

[2fac323]

This program needs to read the infile and calculate the temperatures for each function. I can only get it to output 0's. Can someone explain the steps needed to make this code work correctly? What am I missing? Should I be passing by reference? If so how??

#include <iostream>
#include <fstream>
#include <iomanip>


using namespace std;

int getData();
double averageHigh();
double averageLow();
double indexHighTemp();
double indexLowTemp();

int i, j;
double hsum = 0, lsum = 0;
double avgh, avgl;
double high = 0, low = 0;
int ind;
int const row = 2, col = 12, num = 12;
double temp[row][col];

int main()
{
    cout <<"Processing Data"<<endl;
    getData();
    averageHigh();
    averageLow();
    indexHighTemp();
    indexLowTemp();
    cout <<" "<<endl;

  system("PAUSE");
  return 0;
}
int getData()
{
       ifstream inFile;
       
       inFile.open ("c:\\Ch9_Ex9Data.txt");
       
       
       
       if (!inFile)
       {
             cout << "Unable to open input file!"<<endl;
             return 1;
             } 
       inFile >> high >> low;
       
       }
double averageHigh()
{
       for(int i=0;i<row;i++)
       {
               for(int j=0;j<col;j++)
               {
                       hsum = (hsum + (temp[0][i]));
                       }
           }
       avgh = hsum / 12;
       cout << "Average high temperature: ";
       cout << avgh <<endl;
       return 0;
       }
double averageLow()
{
       for(int i=0;i<row;i++)
       {
               for(int j=0;j<col;j++)
               {
                       lsum = (lsum + (temp[1][i]));
                       }
           }
       avgl = lsum / 12;
       cout << "Average low temperature: ";
       cout << avgl << endl;
       return 0;
       }
double indexHighTemp()
{
       ind = 0;
       for(int i=0;i<row;i++)
       {
               for(int j=0;j<col;j++)
               {
                       if (high <= (temp[0][i]))
                       {
                                high = (temp[0][i]);
                                ind = i;
                       }
                       }
           }
       cout << "Highest temperature: ";
       cout << (temp[0][ind]) << endl;
       return 0;
       }
double indexLowTemp()
{
       ind = 0;
       for(int i=0;i<row;i++)
       {
               for(int j=0;j<col;j++)
               {
                       if (low >= (temp[1][i]))
                       {
                               low = (temp[1][i]);
                               ind = i;
                   }
                   }
                   }                  
       cout << "Lowest temperature: ";
       cout << (temp[1][ind]) << endl;
       return 0;
       }

[Ancient Dragon]

Look at your function getData(). It isn't reading the data from the file -- all it is reading is two numbers called low and high. What its supposed to do is read all the numbers into the array temp. You will have to add a loop so that it can do that.

[2fac323]

Ok, I have narrowed it down to me needing a while loop. But I am having trouble understanding how to use it correctly. Can someone give me an example of a while loop that reads from a one column in a txt infile and reads to the end?
Here is what I came up with-
infile example:
34 -12
30 -21
32 -18
40 -5
52 10
75 32

while (inFile)
       {
             if (row = 0; row < 13; row++)
             {
                     inFile >>high >> low;
                     }
             if (col = 0; col < 13; col++)
             {
                     inFile>>high >>low;

[Ancient Dragon]

does the file contain those dashes you posted ? If not, then just do something like this:

while( inFile >> temp[i][0] >> temp[i][1])
{
    ++i;
}

you have the rows and columns of that temp array backwards. row should be 12 and columns should be 2. You want the array to look something like this:

Col1  Col2
|------|-------|
|------|-------|
|------|-------|
|------|-------|
|------|-------|
|------|-------|
|------|-------|
|------|-------|
|------|-------|
|------|-------|
|------|-------|
|------|-------|

[2fac323]

Thanks alot! I am sure this will help me.