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

Question

Todd Martin

Computers & Technology

4 November, 11:16

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

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Answers (1)

Know the Answer?

Alan Le · Answer 1

see explaination

Explanation:

#include

#include

#include

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
{

for (int j=0; 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
{

avg = 0;

for (int j=0; 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
{

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
{

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
{

for (int j=0; j
{

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

}

}

for (int i=0; i
{

for (int j=0; j
{

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

}

diagFile << endl;

}

}

return 0;

}