Lab 9: File Processing
Lab Activity
The National
Weather Service publishes data files containing daily temperature and
precipitation information*. Each data file contains the daily
information for a particular month and location. We will be using the data from November 2001 to practice
manipulating data files in C++.
The file
named “weather.dat”
contains the required weather information.
You can download the file by right-clicking on this link: weather.dat
and choosing “Save target as”. Be sure
to save the file to your Cygwin home directory. Each line of the data file contains:
Someone started
writing a program to produce a monthly report containing basic weather
information. Finish the program so that
it will do the following:
Here are some
sample lines from the input data file:
1 56
35 0.05
2 76
65 0.00
3 75
56 0.03
Here is the
incomplete program:
#include
<fstream>
#include
<iostream>
using namespace
std;
int main()
{
// Create the input and output file streams
// Open the input and output files
// Declare variables for storing information
// from the input data file
int dayNumber;
int maxTemp;
int minTemp;
float dayPrecip;
// Declare variables for calculated
information
float dayAverageTemp;
float totalPrecip;
// Write the column headings for the output
// file
outData << " Day MaxTemp MinTemp
AverageTemp" << endl;
outData << "---------------------------------"
<< endl;
// Loop while there is still information in
the file
while (
)
{
// Get the day number, maximum
temperature, minimum
// temperature and amount of
precipitation from the
// input data file.
//
Calculate the day's average temperature
dayAverageTemp =
// Add the day's precipitation to the
total monthly precipitation
// Write the day number, maximum
temperature, minimum
// temperature, and average temperature
to the output
// data file.
}
// Write the total monthly precipitation to
the output file
// Close the input and output data files
return 0;
}