ПОЖАЛУЙСТА ОЧЕНЬ НАДО
помогите пожалуйста в программе с++

#include <iostream>using namespace std;int i, j, k, s;double sr;int mat[4][4];int main(){        s=0;    k=0;    cout<<"Do";    for(i=1; i<=4; i++)     {        for(j=1; j<=4; j++)         {            mat[i][j]=rand() % 255;            s=s+mat[i][j];            cout<<mat[i][j]<<"\t";            k++;            }            cout<<"";            }    sr=s/k;     cout<<"Srednee znachenie="<<sr<<"";               for(i=1; i<=4; i++)        {               for(j=1; j<=4; j++)            {               if (mat[i][j]>sr)               {                             mat[i][j]=255;                             }               else               {                   mat[i][j]=0;                   }                   }                   }        cout<<"Posle";                   for(i=1; i<=4; i++)        {               for(j=1; j<=4; j++)            {                     cout<<mat[i][j]<<"\t";                     }                     cout<<"";                     }                     system("pause");return 0;}