Dev C++ Snake And Ladder Game Code

Hi,
I have an assignment to submit on a Snakes and Ladders game built through 2D array. I have got the game running without 2D Array but having issues calling these arrays when switching in 2D. Could you guys help me out and point out the issues?
The code is given below (Haven't called the arrays yet):
#include <iostream>
#include <fstream>
#include <stdlib.h>
#include <string.h>
using namespace std;
void read(int[][5],ifstream&);
int rand(int&);
void printboard(int);
int main()
{
ifstream a;
int rows=4;
int cols=5;
int score[rows][cols];
string player1;
string player2;
int player1_score;
int player2_score;
cout<<'Enter the name of player 1:'<<endl;
cin>>player1;
cout<<'Enter the name of the player 2:'<<endl;
cin>>player2;
while(player1_score<20 && player2_score<20)
{
cout<<player1<<'Please enter a key to generate a random number:'<<endl;
cin.get();
rand(player1_score);
cout<<'Your score is:'<<player1_score<<endl;
cout<<player2<<'Please enter a key to generate a random number:'<<endl;
cin.get();
rand(player2_score);
cout<<'Your score is:'<<player2_score<<endl;
}
if(player1_score>player2_score)
{
cout<<player1<<'is the winner.'<<endl;
}
if(player2_score>player1_score)
{
cout<<player2<<'is the winner.'<<endl;
}
if(player1_scoreplayer2_score)
{
cout<<'The match is a draw.'<<endl;
}
return 0;
}
int rand(int &score)
{
int random;
random=rand()%6;
cout<<'Your random number is:'<<random<<endl;
score=random+score;
return score;
}
void printboard(int score[4][5])
{
score[0][0]=1;
score[0][1]=2;
score[0][2]=3;
score[0][3]=4;
score[0][4]=5;
score[1][0]=6;
score[1][1]=7;
score[1][2]=8;
score[1][3]=9;
score[1][4]=10;
score[2][0]=11;
score[2][1]=12;
score[2][2]=13;
score[2][3]=14;
score[2][4]=15;
score[3][0]=16;
score[3][1]=17;
score[3][2]=18;
score[3][3]=19;
score[3][4]=20;
cout<<score[0][0]<<' '<<score[0][1]<<' '<<score[0][2]<<' '<<score[0][3]<<' '<<score[0][4]<<endl;
cout<<endl;
cout<<score[1][0]<<' '<<score[1][1]<<' '<<score[1][2]<<' '<<score[1][3]<<' '<<score[1][4]<<endl;
cout<<endl;
cout<<score[2][0]<<' '<<score[2][1]<<' '<<score[2][2]<<' '<<score[2][3]<<' '<<score[2][4]<<endl;
cout<<endl;
cout<<score[3][0]<<' '<<score[3][1]<<' '<<score[3][2]<<' '<<score[3][3]<<' '<<score[3][4]<<endl;
}
void read(int score[4][5],ifstream&a)
{
a.open('values.txt');
if(!a)
{
cerr<<'File location is invalid.'<<endl;
}
while(!a.eof())
{
for(int i=0;i<4;i++)
{
for(int j=0;j<5;j++)
{
a>>score[i][j];
}
}
}
}