#include <iostream> #include <fstream> #include <string> using namespace std; in

Question

#include <iostream>

#include <fstream>

#include <string>

using namespace std;

int main()

{

//Declare and initialize objects.

int num_data_pts(0), k;

double time, motion, sum(0), max, min;

string file nname;

ifstream sensor3;

ofstream report;

// Prompt user for name of input file.

cout << " Enter the name of the input file";

cin >> filename;

//open file and read teh first data point.

sensor3.open(filename.c_str());

if (sensor3.fail())

{

cerr << "Enter opening input file ";

exit(1);

}

// open report file.

report.open("sensor3Report.txt") ;

//While not at the end of the file.

//Read and accumulate information

sensor3 >> time >> motion; //initial input

while ( !sensor3.eof() )

{

num_data_pts++;

if (num_data_pts == 1)

{

max = min = motion;

}

sum +=motion;

if motion (motion > max)

{

max =motion;

}

if (motion < min)

{

min = motion;

}

sensor3 >> time >> motion; //input next

}

//Set format flags.

report.setf(ios::fixed) ;

report.setf(ios::showpoint) ;

report.precision(2) ;

//print summary information.

report << "Number of sensor readings: "

<< num_data_pts << endl

<<"Average readings : "

<< sum/num_data_pts << endl

<< "Maximum reading: "

<< max << endl

<< "Minimum reading: "

<< min << endl;

//Close file and exit program.

sensor3.close() ;

report.close() ;

return0 ;

} //end main

Sensor3.dat

0 132.5

0.1 147.2

0.2 148.3

0.3 157.3

0.4 163.2

0.5 158.2

0.6 169.3

0.7 148.2

0.8 137.6

0.9 135.9

Sensor3Report.txt
Number of sensor readings: 10
Average raeding: 149.77
Maximum reading: 169.30
Minimum reading: 132.50

1.Run the program with an empty data file. If the output is in error, modify the program to correct the error

Important Note

Instead of exit(1); use exit(EXIT_FAILURE); and instead of return 0; use return EXIT_SUCCESS;

also, show the output

Explanation / Answer

//Please see the updated code below:

#include <iostream>

#include <fstream>

#include <string>

using namespace std;

int main()

{

//Declare and initialize objects.

int num_data_pts(0), k;

double time, motion, sum(0), max, min;

string filename;

ifstream sensor3;

ofstream report;

// Prompt user for name of input file.

cout << " Enter the name of the input file";

cin >> filename;

//open file and read teh first data point.

sensor3.open(filename.c_str());

if (sensor3.fail())

{

     cerr << "Enter opening input file ";

     exit(EXIT_FAILURE);

}

// open report file.

report.open("sensor3Report.txt") ;

//While not at the end of the file.

//Read and accumulate information

sensor3 >> time >> motion; //initial input

while ( !sensor3.eof() )

{

num_data_pts++;

if (num_data_pts == 1)

{

max = min = motion;

}

sum +=motion;

if (motion > max)

{

max =motion;

}

if (motion < min)

{

min = motion;

}

sensor3 >> time >> motion; //input next

}

//Set format flags.

report.setf(ios::fixed) ;

report.setf(ios::showpoint) ;

report.precision(2) ;

//print summary information.

report << "Number of sensor readings: "

        << num_data_pts << endl

        <<"Average readings :          "

        << sum/num_data_pts << endl

        << "Maximum reading:           "

        << max << endl

        << "Minimum reading:            "

        << min << endl;

        //Close file and exit program.

        sensor3.close() ;

report.close() ;

return EXIT_SUCCESS;

} //end main

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