Question

Obtain a file name from the user, which will contain data pertaining to a 2D array Create a file for each of the following: averages.txt : contains the overall average of the entire array, then the average of each row reverse.txt : contains the original values but each row is reversed flipped.txt : contains the original values but is flipped top to bottom (first row is now the last row etc.) If the dimensions of array are symmetric (NxN), create a diagonal.txt: contains the array mirrored on the diagonal

Answer 1

see explaination

Step-by-step explanation:

#include <iostream>

#include <fstream>

#include <iomanip>

using namespace std;

int main()

{

string filename, file1, file2, file3, file4;

cout << "Enter the filename : ";

getline(cin, filename);

int row, col;

ifstream ifile;

ifile.open(filename.c_str());

if(!ifile)

{

cout << "File does not exist." << endl;

}

else

{

ifile >> row >> col;

float mat[row][col], diag[row][col];

for(int i=0; i<row; i++)

{

for(int j=0; j<col; j++)

ifile >> mat[i][j];

}

cout << "Enter the filename to save averages : ";

getline(cin, file1);

ofstream avgFile(file1.c_str(), std::fstream::in | std::fstream::out | std::fstream::app);

float t_avg = 0, avg = 0;

for(int i=0; i<row; i++)

{

avg = 0;

for(int j=0; j<col; j++)

{

avg += mat[i][j];

}

t_avg += avg;

avg = avg/col;

avgFile << std::fixed << std::setprecision(1) << "Row " << i+1 << " average: " << avg << endl;

}

t_avg = t_avg / (row*col);

avgFile << std::fixed << std::setprecision(1) << "Total average: " << t_avg << endl;

cout << "Enter the filename to store reverse matrix : ";

getline(cin, file2);

ofstream revFile(file2.c_str(), std::fstream::in | std::fstream::out | std::fstream::app);

for(int i=0; i<row; i++)

{

for(int j=col-1; j>=0; j--)

{

revFile << std::fixed << std::setprecision(1) << mat[i][j] << " ";

}

revFile << endl;

}

cout << "Enter the filename to store flipped matrix : ";

getline(cin, file3);

ofstream flipFile(file3.c_str(), std::fstream::in | std::fstream::out | std::fstream::app);

for(int i=row-1; i>=0; i--)

{

for(int j=0; j<col; j++)

{

flipFile << std::fixed << std::setprecision(1) << mat[i][j] << " ";

}

flipFile << endl;

}

cout << "Enter the filename to store diagonal matrix : ";

getline(cin, file4);

ofstream diagFile(file4.c_str(), std::fstream::in | std::fstream::out | std::fstream::app);

for(int i=0; i<row; i++)

{

for(int j=0; j<col; j++)

{

diag[j][i] = mat[i][j];

}

}

for(int i=0; i<col; i++)

{

for(int j=0; j<row; j++)

{

diagFile << std::fixed << std::setprecision(1) << diag[i][j] << " ";

}

diagFile << endl;

}

}

return 0;

}