Question

Objectives

To learn to code, compile, and run a program using file input and an output file.

Assignment

Plan and code a program utilizing one file for input and one file for output to solve the following problem:

Write a program to determine the highest number, the lowest number, their total, and the average of each line of numbers in a file. A file contains 7 numbers per line. How many lines a file contains is unknown.

Note

Label all output clearly. Be sure your output file contains user prompts and what was entered by the user in addition to the results of your program processing. Be sure your output file contains data that was input in addition to the results of your program processing. Create the data file below using your text editor or Notepad. Copying and pasting the numbers might create problems with reading from the files. Type in the numbers. Separate numbers by using either the tab key or blank spaces.

Data File Sample

346       130       982       90         656       117       595

415       948       126       4            558       571       87

42         360       412       721       463       47         119

441       190       985       214       509       2            571

77         81         681       651       995       93         74

310       9            995       561       92         14         288

466       664       892       8            766       34         639

151       64         98         813       67         834       369

Answer 1

Here is the code for the given problem :-

#include<iostream.h>
#include<fstream.h>
#include<bits/stdc++.h>
using namespace std;
 
int main()
{
    std::ifstream fin("input.txt");
    int val=0, rows=0, cols=0, numItems=0;
    ofstream myfile;
    myfile.open ("output.txt");
    
    while( fin.peek() != '\n' && fin >> val )
    {
        myfile << val << ' ';
        ++numItems;
    }
    cols = numItems;// # no of columns =7

    myfile << '\n';
    while( fin >> val )
    {
        ++numItems;
        myfile << val << ' ';
        if( numItems%cols == 0 ) cout << '\n';
    }

    if( numItems > 0 )// got data!
    {
        rows = numItems/cols;
        myfile << "rows = " << rows << ", cols = " << cols << '\n';
    }
    else// didn't get any data
        myfile << "data reading failed\n";

    vector<vector<<int>> matrix;
    while(row!=0)
    {
        vector<int> a;
        int sum=0
        while( fin.peek() != '\n' && fin >> val )
        {
            sum+=val;
            a.push_back(val);
        }
        myfile << "\nMax Element of this line = "
         << *max_element(a.begin(), a.end()); 
        myfile << "\nMin Element of this line = "
         << *min_element(a.begin(), a.end());
        myfile<<"\nAverage of the elements of this line = "
         << sum/7;
        row--;
    }
    myfile.close();
    return 0;
    
}

Here we read the file "input.txt" using ifstream fin, and writes the data present in it along with max element, min element, and the average of each line in another file "output.txt" and then close the file.

Hope this helps :) Feel free to ask any doubt in the comment section.