Write a program to multiply two matrices

Source Code: 

#include <iostream>

#include <iomanip>

using namespace std;

void display(int mat[][2],int r){

    for (int i=0;i<r;i++){

        for(int j=0;j<2;j++){

            cout<<setw(5)<<mat[i][j];}

        cout<<endl;}

    cout<<"---------------------------------------------------"<<endl;

}

void disp_product(int mat1[][2],int mat2[][2],int r){

    int result[r][2];

    cout<<"The product of the matrices is: "<<endl;

    for (int i = 0; i < r; i++) {

        for (int j = 0; j < 2; j++) {

            result[i][j] = 0; 

            for (int k = 0; k < r; k++) {

                result[i][j] += mat1[i][k] * mat2[k][j];} 

            cout <<setw(5)<<result[i][j];

        }

        cout << endl;}}

int main(){

    int r;

     cout<<"Enter the number of rows: ";

    cin>>r;

    cout<<"---------------------------------------------------"<<endl;

    int mat1[r][2],mat2[r][2];

    for (int i=0;i<r;i++){

        for(int j=0;j<2;j++){

            cout<<"Enter the elements for the first matrix: ";

            cin>>mat1[i][j];}}

    cout<<"---------------------------------------------------"<<endl;

    for (int i=0;i<2;i++){

        for(int j=0;j<r;j++){

            cout<<"Enter the elements for the second matrix: ";

            cin>>mat2[i][j];}}

    cout<<"---------------------------------------------------"<<endl;

    cout<<"The first matrix is: "<<endl;

    display(mat1,r);

    cout<<"The second matrix is: "<<endl;

    display(mat2,r);

    disp_product(mat1,mat2,r);

    return 0;}