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Passing infile values??
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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;
}
•
•
Join Date: Aug 2005
Posts: 15,381
Reputation: 
Solved Threads: 1466
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.
Don't PM me with questions -- you might get a nasty PM in response. If you have a question then post it in one of the forums.
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
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; •
•
Join Date: Aug 2005
Posts: 15,381
Reputation:
Solved Threads: 1466
does the file contain those dashes you posted ? If not, then just do something like this:
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:
C++ Syntax (Toggle Plain Text)
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:
C++ Syntax (Toggle Plain Text)
Last edited by Ancient Dragon; Jul 31st, 2008 at 1:22 pm.
Don't PM me with questions -- you might get a nasty PM in response. If you have a question then post it in one of the forums.
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