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Join Date: Jul 2008
Posts: 21
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Newbie Poster
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;
}
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Join Date: Aug 2005
Location: near St Louis, Missouri, USA
Posts: 11,861
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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.
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Join Date: Jul 2008
Posts: 21
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Newbie Poster
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; •
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Join Date: Aug 2005
Location: near St Louis, Missouri, USA
Posts: 11,861
Reputation:
Rep Power: 40
Solved Threads: 1012
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:
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 |------|-------| |------|-------| |------|-------| |------|-------| |------|-------| |------|-------| |------|-------| |------|-------| |------|-------| |------|-------| |------|-------| |------|-------|
Last edited by Ancient Dragon : Jul 31st, 2008 at 1:22 pm.
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