1

1.Se citesc de la tastatura n lini si m coloane,elementele unei matrici a nr. intregi.
a)Sa se afle media aritmetica?
b)De cate ori apare elementul x?
c)Afiseaza numarul de elemente pozitive,negative si nule?


a) #include<iostream>
   using namespace std;
   int main()
   {int m,n,a[20][50],i,j;
    cout<<"n=";cin>>n;
    cout<<"m=";cin>>m;
    for(i=0;i<n;i++)
       for(j=0;j<m;j++)
          {cout<<"a["<<i<<"]["<<j<<"]=";
           cin>>a[i][j];
          }
  for(i=0;i<n;i++)
     for(j=0;jm;j++)
        {cout<<a[i]<<a[j]<<" ";
         ma=0;
         s=0;
  for(i=0;i<n;i++)
    for(j=0;j<m;j++)
        s=s+a[i][j];
        ma=s/n*m;
        cout<<"ma="<<ma;
       }
        return 0;
       }
b) #include<iostream>
   using namesapce std;
   int main()
  {int n,m,a[30][50],i,j,x,k;
    cout<<"n=";cin>>n;
    cout<<"m=";cin>>m;
  for(i=0;i<n;i++)
     for(j=0;j<m;j++)
        {cout<<"a["<<i<<"]["<<j<<"]=";
         cin>>a[i][j];
        }
  cout<<"x=";cin>>x;
  for(i=0;i<n;i++)
     for(j=0;j<m;j++)
       if(x==a[i][j])
          k++;
  cout<<x<<"apare de"<<k<<"ori in tablouri";
   return 0;
  }
c) #include<iostream>
   using namespace std;
   int main()
  {int n,m,a[20][30],i,j,k;
   cout<<"n=";cin>>n;
   cout<<"m=";cin>>m;
for(i=0;i<n;i++)
   for(j=0;j<m;j++)
     {cout<<a"["<<i<<"]["<<j<<"]=";
      cin>>a[i][j];
     }
for(i=0;i<n;i++)
   for(j=0;j<m;j++)
      {if(a[i][j]==0)
        nul++;
       else if(a[i][j]>0)
        poz++;
       else
        neg++;
      }
cout<<"pozitive"<<poz<<endl;
cout<<"nule"<<nul<<endl;
cout<<"negative"<<neg<<endl;
return 0;
   }