Matric Addition(A+B+C)

#include <bits/stdc++.h>
using namespace std;

int main()
{
    int i, j, k, n, m, r, c;
    cout<<"Enter the dimension of the matrices\n";
    cout<<"Number of rows : ";
    cin>>r;
    cout<<"Number of columns : ";
    cin>>c;
    int A[r][c], B[r][c], C[r][c];
    cout<<"Enter the elements of A matrice :\n";
    for(i = 0; i < r; i++)
        for(j = 0; j < c; j++)
            cin>>A[i][j];
    cout<<"Enter the elements of B matrice :\n";
    for(i = 0; i < r; i++)
        for(j = 0; j < c; j++)
            cin>>B[i][j];
    cout<<"Enter the elements of C matrice :\n";
    for(i = 0; i < r; i++)
        for(j = 0; j < c; j++)
            cin>>C[i][j];
    cout<<"A+B+C : \n";
    for(i = 0; i < r; i++)
    {
        for(j = 0; j < c; j++)
            cout<<A[i][j]+B[i][j]+C[i][j]<<" ";
        cout<<endl;
    }
}