square diagram in C++

#include <string.h>
 #include <iostream.h>
 #include <conio.h>int main(){
    int u,v, k;
    int n = 0;
    cout<<"Program for displaying pattern of *.\n";
    cout<<"Enter the width of square: ";
    cin>>n;
 cout<<"Enter the length of square: ";
    cin>>v;
  cout<<"\nHere is the square of Stars\n";

    for (int i = 1; i <= n+3; i++)
    { cout<<"*";
    } cout<<endl;
    for (int i = 1; i <= n+3; i++)
    { cout<<"*";
    } cout<<endl;
    for (int i = 1; i <= v; i++)
    { cout<<"**";
        for (int i = 1; i <= n-1; i++)
    { cout<<" ";}
   
    cout<<"**"<<endl;
    }
    for (int i = 1; i <= n+3; i++)
    { cout<<"*";
    } cout<<endl;
    for (int i = 1; i <= n+3; i++)
    { cout<<"*";
    }
    getch();
    return 0;}