C++ Program to perform Matrix Multiplication

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Perform Matrix Multiplication

In the following example, we will multiply the two given matrices (two-dimensional arrays).

Example

C++ Compiler
#include <iostream> using namespace std; int main() { int i, j, k; int arr1[3][3] = { {1, 1, 1}, {1, 1, 1}, {1, 1, 1} }; int arr2[3][3] = { {2, 2, 2}, {2, 2, 2}, {2, 2, 2} }; int arr3[3][3] = {0}; cout << "Matrix A (3 x 3):\n"; for(i=0; i<3; i++) { for(j=0; j<3; j++) cout << arr1[i][j] << " "; cout << "\n"; } cout << "\nMatrix B (3 x 3):\n"; for(i=0; i<3; i++) { for(j=0; j<3; j++) cout << arr2[i][j] << " "; cout << "\n"; } for(i=0; i<3; i++) { for(j=0; j<3; j++) { for(k=0; k<3; k++) arr3[i][j] = arr3[i][j] + arr1[i][k] * arr2[k][j]; } } cout << "\nMatrix Multiplication (A x B) :\n"; for(i=0; i<3; i++) { for(j=0; j<3; j++) cout << arr3[i][j] << " "; cout << "\n"; } return 0; }

In the following example, we will get the values for (3 x 3) Matrices A and B from the user and display the matrix multiplication.

Example

C++ Compiler
#include <iostream> using namespace std; int main() { int i, j, k, arr1[3][3], arr2[3][3]; int arr3[3][3] = {0}; cout << "Enter Matrix A (3 x 3):\n"; for(i=0; i<3; i++) { for(j=0; j<3; j++) cin >> arr1[i][j]; } cout << "\nEnter Matrix B (3 x 3):\n"; for(i=0; i<3; i++) { for(j=0; j<3; j++) cin >> arr2[i][j]; } for(i=0; i<3; i++) { for(j=0; j<3; j++) { for(k=0; k<3; k++) arr3[i][j] = arr3[i][j] + arr1[i][k] * arr2[k][j]; } } cout << "\nMatrix Multiplication (A x B):\n"; for(i=0; i<3; i++) { for(j=0; j<3; j++) cout << arr3[i][j] << " "; cout << "\n"; } return 0; }

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