I need to Construct a program that inputs the entries of two matrices and multiplies them. Construct the program so that it gives an error message if they cannot be multiplied.
What I have done so far
I need to Construct a program that inputs the entries of two matrices and multiplies them. Construct the program so that it gives an error message if they cannot be multiplied.
What I have done so far
#include <iostream>
#include <vector>
using namespace std;
class MatrixNxN
{
public:
int numRows;
int numCols;
float index[4][4];
};
void printMatrix(MatrixNxN a);
MatrixNxN inputMatrix();
//This function returns true if the matrices are compatible for multiplication.
bool canMultiplyMatrices( MatrixNxN a, MatrixNxN b );
//This function actually multiplies the matrices together.
MatrixNxN multiplyMatrices(MatrixNxN a, MatrixNxN b);
void main()
{
cout << "Please enter matrix A:" << endl;
MatrixNxN A = inputMatrix();
printMatrix( A );
cout << " Please enter matrix B:" << endl;
MatrixNxN B = inputMatrix();
printMatrix (B);
//I need help checking to see if I can multiply the two matrices.
// If not, say so and return.
//I need help multiplying the matrices to get a result.
//I need help printing the result.
}
MatrixNxN inputMatrix()
{
MatrixNxN temp;
//loop through rows
int rows = 0, cols = 0;
while( rows <= 0 || rows > 4 )
{
cout << "Please enter a row count between 1 and 4: ";
cin >> rows;
}
while( cols <= 0 || cols > 4 )
{
cout << "Please enter a column count between 1 and 4: ";
cin >> cols;
}
temp.numRows = rows;
temp.numCols = cols;
for(int i = 0; i < rows; ++i)
{
//loop through column at each row
for(int j = 0; j < cols; ++j)
{
//i is the row & j is the column
cout << "Enter row " << i << " column " << j << ": " << endl;
cin >> temp.index[i][j];
}
}
return temp;
}
void printMatrix(MatrixNxN a)
{
for(int i = 0; i < a.numRows; ++i)
{
//loop through column at each row
for(int j = 0; j < a.numCols; ++j)
{
//i is the row & j is the column
cout << "row " << i << " column " << j << ":" << a.index[i][j] << endl;
}
}
}
bool canMultiplyMatrices( MatrixNxN a, MatrixNxN b )
{
//What do I do here to find out if the matrices are compatible for multiplication?
return false;
}
MatrixNxN multiplyMatrices(MatrixNxN a, MatrixNxN b)
{
MatrixNxN temp;
//I need help filling in the entries of temp. Don't forget to set its numRows and numCols fields!
//I need to use a loops to multiply these matrices. Follow what the other functions are doing
//and I'll need a third loop in the middle to add up the terms for each entry in the result.
return temp;
}
