C++ Program to perform Matrix Multiplication

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; }

Join Our Channel

Join our telegram channel to get an instant update on depreciation and new features on HTML, CSS, JavaScript, jQuery, Node.js, PHP and Python.

This channel is primarily useful for Full Stack Web Developer.

Share this Page

Meet the Author