Multiplying Dynamic Arrays
This code will compile and give my results, although I don't if this is correct. If I make the array 2X2, and I make each matrix:
1,1
1,1
2,2
2,2
I get this as a result:
3,6
3,6
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#include <iostream>
using namespace std;
int main()
{
//Preconditions: Arrays must have equal dimensions
//Postconditions: Multiplies the contents of the two arrays
int a1[20][20];
int a2[20][20];
int product[20][20];
int d1,d2;
int i,j,k;
cout << "Enter the number of row and column dimensions of the array: \n";
cin >> d1 >> d2;
cout << "Enter the elements in your first matrix\n";
for (i = 0; i < d1; i++)
{
for (j = 0; j < d2; j++)
{
cout << "Element " << i << "," << j << " = ";
cin >> a1[i][j];
}
}
cout << "Enter the elements in your second matrix : \n";
for (i = 0; i < d1; i++)
{
for (j = 0; j < d2; j++)
{
cout << "Element " << i << "," << j <<" = ";
cin >> a2[i][j];
}
}
cout << "First Matrix \n";
for (i = 0; i < d1; i++)
{
for (j = 0; j < d2; j++)
{
cout << " " << a1[i][j];
}
cout << "\n";
}
cout << "Second Matrix \n";
for (i = 0; i < d1; i++)
{
for (j = 0; j < d2; j++)
{
cout << " " << a2[i][j];
}
cout << "\n";
}
cout << "The product of two matrices \n";
for(i = 0; i < d1; i++)
{
for(j = 0; j < d2; j++)
{
product[i][j] = 0;
for(k = 0; k < d1; k++)
{
product[i][j] = product[i][j] + a1[i][k] * a2[k][j];
}
}
}
for (i = 0; i < d1; i++)
{
for (j = 0; j < d2; j++)
{
cout << " " << product[i][j];
}
cout << "\n";
}
return 0;
}
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My problem is that I think the multiplication is off...
Interesting. When I run the program, I'm getting the correct result of an all-4 matrix. :/
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