C++ Program of Multiplying Two Matrices using 2D Array

#include<iostream>
using namespace std;
int main(){
//Using const int for array size
    const int row=2,col=2;
// if not use const error found
cout<<"Size of Matrices : "<<row<<" X "<<col<<endl;
cout<<"Enter Value For FirstMatrix Matrix:"<<endl;

    int firstMatrix[row][col];
    int secondMatrix[row][col];
    int resultantMatrix[row][col], var;

int i,j;
    for( i=0;i<row;i++){
        cout<<"Enter value for row number: "<<i+1<<endl;
        for( j=0;j<col;j++){
            cin>>firstMatrix[i][j];
        }
    }
cout<<"\n\n\nEnter Value For SecondMatrix Matrix:"<<endl;
    for( i=0;i<row;i++){
        cout<<"Enter value for row number: "<<i+1<<endl;
        for( j=0;j<col;j++){
            cin>>secondMatrix[i][j];
        }
    }
var=0;
        // ResultantMatrixant Matrix
        for( i=0;i<row;i++){
            for( j=0;j<col;j++){
                for(int k=0;k<row;k++){
                   var=var+(firstMatrix[i][k]*secondMatrix[k][j]);
                   cout<<var<<endl;
                    }
                 resultantMatrix[i][j]=var;
                 var=0;
            }
        }
cout<<"\n\n\t\tResultant Matrix:"<<endl;

    for( i=0;i<row;i++){
        cout<< endl;
        for( j=0;j<col;j++){
            cout<<"\t\t"<<resultantMatrix[i][j]<<"    ";
        }
    }
return 0;
}