Question

Assume that a file containing a series of integers is named number.dat and exists on the computer's disk. Design a program that calculates the average, and the largest number stored in the file. c++

Answer 1

#include <fstream> //class ofstream in the fstream

#include <string>

#include <cstdlib> // for the exit()

#include <iostream>

using namespace std;

int main()

{

ofstream foutstr;// for declaring the output file stream

ifstream finstr; // for declaring the input file stream

int x(0);

double average(0.0);

string filename="number.dat";

int total(0);

// open the file for inputing

finstr.open("C:\\Users\\sam\\OneDrive\\Documents\\Visual Studio 2017\\Projects\\Project sam\\\umber.dat", ios::in);

// check whether the file can be opened or not

if (!finstr.is_open())

{

cerr << "Not able to open the file " << filename << endl;

exit(10);

}

// read text from file

fin >> x;

int a(0);

int b(0);

int largest=0;

while (!fin.fail())

{

cout << "Read integer: " << x << endl;

fin >> x;

if (Largest<x)

{

Largest=x;

}

total += x;

if (x%2 == 0)

{ a++; }

else

{ b++;}

}

avg = sum/(a+b);

cout << "The stored integer's average is:" << avg << endl;

cout << "The largest number in the file is:"<<largest<<endl;

// check whether there is any error!

if (!finstr.eof())

{

cerr << "Error reading file " << name << endl;

exit(20);

}

// close file stream finstr

finstr.close();

return 0;

}

Step-by-step explanation:

#include <fstream> //class ofstream in the fstream

#include <string>

#include <cstdlib> // for the exit()

#include <iostream>

using namespace std;

int main()

{

ofstream foutstr;// for declaring the output file stream

ifstream finstr; // for declaring the input file stream

int x(0);

double average(0.0);

string filename="number.dat";

int total(0);

// open the file for inputing

finstr.open("C:\\Users\\sam\\OneDrive\\Documents\\Visual Studio 2017\\Projects\\Project sam\\\umber.dat", ios::in);

// check whether the file can be opened or not

if (!finstr.is_open())

{

cerr << "Not able to open the file " << filename << endl;

exit(10);

}

// read text from file

fin >> x;

int a(0);

int b(0);

int largest=0;

while (!fin.fail())

{

cout << "Read integer: " << x << endl;

fin >> x;

if (Largest<x)

{

Largest=x;

}

total += x;

if (x%2 == 0)

{ a++; }

else

{ b++;}

}

avg = sum/(a+b);

cout << "The stored integer's average is:" << avg << endl;

cout << "The largest number in the file is:"<<largest<<endl;

// check whether there is any error!

if (!finstr.eof())

{

cerr << "Error reading file " << name << endl;

exit(20);

}

// close file stream finstr

finstr.close();

return 0;

}