matrixmultiplication.cpp

//given 2 arrays n1xn2 and n2xn3 and multiply matrix
#include <bits/stdc++.h>
using namespace std;
int main()
{
    int n1, n2, n3;
    cin >> n1 >> n2 >> n3;
    int arr1[n1][n2];
    for (int i = 0; i < n1; i++)
    {
        for (int j = 0; j < n2; j++)
        {
            cin >> arr1[i][j];
        }
    }
    int arr2[n2][n3];
    for (int i = 0; i < n2; i++)
    {
        for (int j = 0; j < n3; j++)
        {
            cin >> arr2[i][j];
        }
    }
    int ans[n1][n3];
   for (int i = 0; i < n1; i++)
    {
        for (int j = 0; j < n3; j++)
        {
            ans[i][j]=0;
        }
    }

    for (int i = 0; i < n1; i++)
    {
        for (int j = 0; j < n3; j++)
        { 
            for (int k = 0; k < n2; k++)
            {
                ans[i][j]+=arr1[i][k]*arr2[k][j];
            }
        }
    }

for (int i = 0; i < n1; i++)
    {
        for (int j = 0; j < n3; j++)
        { 
            cout<<ans[i][j]<<" ";
    }
    cout<<endl;
    }
    return 0;
}