C++ Matrix Multiplication

// This program finds the product of 2 matrices entered by the user. 
#include <iostream> 
#include <iomanip> 
using namespace std; 
#define SIZE 10 //SIZE of ARRAYS 
//function(s) declaration 
void input(int [][SIZE], int [][SIZE], const int&, const int&, const int&); 
void process(int [][SIZE], int [][SIZE], int [][SIZE], const int&, const int&, const int&); 
void display(int [][SIZE], int [][SIZE], int [][SIZE], const int&, const int&, const int&); 
int main() 
{ 
system("color f0");//for changing the color of output screen 
//declaration of ARRAYS 
int a[SIZE][SIZE], b[SIZE][SIZE], c[SIZE][SIZE]; 
//declaration of variables 
int m,n; // Rows & Columns of Matrix A respectively 
int x,y; // Rows & Columns of Matrix B respectively
bool flag = true; //flag variable 
cout<<"Rule for Multiplication of matrices : \n\nNumber of COLUMNS of Matrix 'A' must be equal to Number of ROWS of Matrix 'B'."<<endl<<endl;
//input 
do 
{ 
cout<<"\n\nEnter the Number of ROWS of Matrix 'A' [Max. 10] : "; 
cin>>m; 
if((m>=1)&&(m<=10)) 
break; 
else 
cout<<"Invalid Input...."<<endl; 
} 
while (1); 
do 
{ 
cout<<"Enter the Number of COLUMNS of Matrix 'A' [Max. 10] : "; 
cin>>n; 
if((n>=1)&&(n<=10)) 
break; 
else 
cout<<"Invalid Input...."<<endl; 
}
 while (1); 
do 
{ 
cout<<"\nEnter the Number of ROWS of Matrix 'B' [Max. 10] : ";
cin>>x; 
if((x>=1)&&(x<=10)) 
break; 
else 
cout<<"Invalid Input...."<<endl; 
} 
while (1); 
do 
{ 
cout<<"Enter the Number of COLUMNS of Matrix 'B' [Max. 10] : "; 
cin>>y; 
if((y>=1)&&(y<=10)) 
break; 
else 
cout<<"Invalid Input...."<<endl;
}
 while (1); 
if(n==x) 
input(a,b,m,n,y); //function calling 
else 
{ 
cout<<"Multiplication is not possible"<<endl; 
flag=false; 
}//end of else 
//processing 
if(flag==true) 
process(a,b,c,m,n,y); //function calling 
//output 
if(flag==true) 
display(a,b,c,m,n,y); //function calling 
cout<<endl<<endl; 
system("pause"); 
return 0; 
}//end of main 
void input(int aa[][SIZE], int bb[][SIZE], const int& mm, const int& nn, const int& yy) 
{
system("cls"); 
cout<<"\t \tFor Matrix 'A'\n\n"; 
for(int i=0; i<mm; i++) 
{ 
for(int j=0; j<nn; j++) 
{ 
cout<<"Enter Element at ROW "<<i+1<<" and COLUMN "<<j+1<<" : "; 
cin>>aa[i][j]; 
}//end of nested for 
}//end of for 
cout<<"\n\n\t\tFor Matrix 'B'\n\n"; 
for(int k=0; k<nn; k++) //because n==x 
{ 
for(int l=0; l<yy; l++) 
{ 
cout<<"Enter Element at ROW "<<k+1<<" and COLUMN "<<l+1<<" : "; 
cin>>bb[k][l]; 
}//end of nested for 
}//end of for 
}//end of input 
void process(int aa[][SIZE], int bb[][SIZE], int cc[][SIZE], const int& mm, const int& nn, const int& yy) 
{ 
for(int i=0; i<mm; i++) 
{ 
for(int j=0; j<yy; j++) 
{ 
cc[i][j]=0; 
for(int k=0; k<nn; k++) 
cc[i][j]=cc[i][j]+(aa[i][k]*bb[k][j]); 
}//end of nested for 
}//end of for 
}//end of process 
void display(int aa[][SIZE], int bb[][SIZE], int cc[][SIZE], const int& mm, const int& nn, const int& yy) 
{ 
system("cls"); 
cout<<"Matrix 'A' of the order "<<mm<<"x"<<nn<<" =\n\n"; 
for (int i=0; i<mm; i++) 
{ 
for(int j=0; j<nn; j++) 
cout<<setw(8)<<aa[i][j]; 
cout<<endl; 
}//end of for 
cout<<"\n\nMatrix 'B' of the order "<<nn<<"x"<<yy<<" =\n\n"; 
for(int k=0; k<nn; k++) //because n==x 
{ 
for(int l=0; l<yy; l++);
cout<<setw(8)<<bb[k][l]; 
cout<<endl; 
}//end of for 
cout<<"\n\n\nTheir Product 'AxB' of the order "<<mm<<"x"<<yy<<" =\n\n"; 
for(int p=0; p<mm; p++) 
{ 
for(int q=0; q<yy; q++) 
cout<<setw(8)<<cc[p][q]; 
cout<<endl; 
}//end of for 
}//end of display