two dimensional array

#include<iostream.h>
#include<conio.h>
#define m 3
#define n 4
 void main()
 {
 int i, j, total=0;
 int x[m][n]={{1,2,3,4},
          {5,6,7,8},
          {9,10,11,12},
          };
 float average;
 clrscr();
 //for loop, row by row
 for(i=0; i<m; i++)
 //for loop, column by column
 for(j=0; j<n; j++)
 {
 cout<<"x["<<i<<"]["<<j<<"]="<<x[i][j]<<endl;
 total=total+x[i][j];
 }
 cout<<"Total of the sequence="<<total<<endl;
 average=(float)total/(float)(m*n);
 cout<<"average="<<total<<"/"<<m*n<<endl;
 cout<<"Average of the sequence="<<average<<endl;
 getch();
 }