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qaws [65]
3 years ago
8

I WILL GIVE BRAINLIEST TO WHO ANSWERS FIRST AND CORRECTLY.

Computers and Technology
1 answer:
Whitepunk [10]3 years ago
7 0

Answer:

Everything is correct except for the last two.

Explanation:

Bullets and numbers can be turned off!

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The answer & explanation for this question is given in the attachment below.

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Write a C program to multiply matrix A and matrix B of variable. For both A and B, the size of the matrix will be given along wi
victus00 [196]

Answer:

<u><em>Code:</em></u>

    #include <iostream>

    #include <fstream>

    #include <cctype>

    #include <cmath>

    #include <vector>

    #include <float.h>

   

    using namespace std;

   

    typedef vector<vector<double> > C2DArray;

   

    void Matrix_Mult(bool* error_flag, const int mRows, const int nCols, const int pCols, const C2DArray A_Matrix, const C2DArray B_Matrix, C2DArray& C_Matrix) {      

     int i = A_Matrix.size(), j = A_Matrix[0].size(), k = B_Matrix[0].size();

     double dummy;

     if ((j != B_Matrix.size()) || (i != mRows) || (j != nCols) || (k != pCols))  *error_flag = true;

   

     if ((C_Matrix.size() != i) || (k != C_Matrix[0].size()))  *error_flag = true;

   

     if (!(*error_flag)){

     for (k = 0; k < mRows; k++) { // Do each row of A with each column of B

      for (i = 0; i < pCols; i++) {

       dummy = 0.0;

       for (j = 0; j < nCols; j++) {

        dummy += A_Matrix[k][j]*B_Matrix[j][i];

          } // End for j

          C_Matrix[k][i] = dummy;

      } // End for i

     } // End for k

     }

   

        return;

    } // End Matrix_Mult

   

    int main()

    {char rflag = 0; //Readiness flag  

   

    cout << "                 Mat_Mul1 (7 June 2013)\n";

    cout << "=========================================================================== \n";

    cout << "This program multiplies two matrices, [A] and [B]: [A][B] = [C].\n";

    cout << "[A] is M X N, [B] is N X P, and [C] is M X P\n";

    cout << "The dimensions of the [A] and [B] matrices, M, N, and P, should \n";

    cout << "have been saved beforehand in a file named mulmatdat.\n";

    cout << "mulmatdat should be in the same folder as the Mat_Mul1 executable.\n";

    cout << "The next values of mulmatdat should be the entries for matrix [A],\n";

    cout << "with data for row 1 first, then row 2, then row 3, etc.\n";

    cout << "The entries for the [B] matrix should follow, in the same order.\n";

    cout << "\nThe data is assumed to be of type double. Variables used within this program\n";

    cout << "are type double.\n";

    cout << "\nThe output is written to the file mulmatout.txt.\n";

   

    cout << "\nIs everything ready (are you ready to continue?)? If yes, Enter y. \n";

    cout << "Otherwise Enter any other key. \n";

    cin >> rflag;

   

    if (toupper(rflag) == 'Y') {

    C2DArray A, B, C; // A, B, and C Matrices

    int i, j, mDim, nDim, pDim; // Array index variables and matrix dimensions

    bool erFlag = false;  // Error flag

   

    ifstream in("mulmatdat.txt", ios::in);

   

    if (!in) {

            cout << "\nCannot open the input file.\n";

         cout << "\nEnter any key to continue. \n";

         cin >> rflag;

            return 0;

    }

   

    in >> mDim >> nDim >> pDim; //Input the Matrices' dimensions from the file

     

    if ((mDim < 1) || (nDim < 1) || (pDim < 1)){

            cout << "\nInvalid dimension entered. Program terminated. \n";

         cout << "\nEnter any key to continue. \n";

         cin >> rflag;

            in.close(); //Close the input file before terminating

            return 0;

    }

   

    ofstream out("mulmatout.txt", ios::out);

    if (!out) {

            cout << "\nCannot open the output file. Program terminated.\n";

         cout << "\nEnter any key to continue. \n";

         cin >> rflag;

            in.close(); //Close the input file before terminating

            return 0;

    }

   

    // Beginning of try block, if vector re-sizing unsuccessful

    try {

   

           // Resize the arrays to the appropriate sizes

            A.resize(mDim); // M rows

         B.resize(nDim); // N rows

         C.resize(mDim); // M rows

            for (i = 0; i < mDim; i++){

               A[i].resize(nDim); // M columns

            C[i].resize(pDim); // P columns

            } // End for i

   

         for (i = 0; i < nDim; i++){

               B[i].resize(pDim); // P columns

            } // End for i

   

    } // End of try block

   

    catch (bad_alloc& xa) { // Catch block, for exceptions

   

            in.close();

            out.close();

            cerr << "\nIn catch block, so an exception occurred: " << xa.what() << "\n";

            cout << "\nEnter any key to continue. \n";

            cin >> rflag;

            return 0;

   

    } // End of catch block

   

    for (i = 0; i < mDim; i++){ //Input the A Matrix from the file

            for (j = 0; j < nDim; j++){

              in >> A[i][j];

            }//End for j

    }//End for i

   

    for (i = 0; i < nDim; i++){ //Input the B Matrix from the file

            for (j = 0; j < pDim; j++){

             in >> B[i][j];

            }//End for j

    }//End for i

   

    in.close(); //Close the input file

   

    Matrix_Mult(&erFlag, mDim, nDim, pDim, A, B, C);

   

    if (erFlag){

      cout << "Inconsistent data sent to Matrix_Mult routine. Matrix multiplication NOT performed. Check data before running again.\n";

    }

    else {

   

     out.precision(DBL_DIG);

   

     out << "\nThe A matrix follows:\n";

     out << "\n";

     for (i = 0; i < mDim; i++){

      for (j = 0; j < nDim; j++){

     out << A[i][j] << " ";

      } // End for j

      out << "\n";

     }//End for i

   

     out << "\nThe B matrix follows:\n";

     out << "\n";

     for (i = 0; i < nDim; i++){

      for (j = 0; j < pDim; j++){

     out << B[i][j] << " ";

      } // End for j

      out << "\n";

    }//End for i

   

     out << "\nThe product matrix, C, follows:\n";

     out << "\n";

     for (i = 0; i < mDim; i++){

      for (j = 0; j < pDim; j++){

       out << C[i][j] << " ";

      } // End for j

      out << "\n";

     }//End for i

   

     cout << "\nDone! The solution is in the text file mulmatout.txt \n";

    } // End else !erFlag

    out.close();

    }

    else cout << "\nNot ready. Try again when ready with information. \n";

    cout << "\nEnter any key to continue. \n";

    cin >> rflag;

    return 0;

    }

<u><em></em></u>

4 0
3 years ago
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