fundamentals of signed and unsigned numbers

#include<iostream.h>
 #include<conio.h>
 void main()
 {
  clrscr();
  int i=32000;
  cout<<i<<endl;
  i=40000;
  cout<<i<<endl;
  signed k=40000;
  cout<<k<<endl;
  unsigned j=40000;
  cout<<j<<endl;
  float l=50000;
  cout<<l<<endl;
  l=555.57;
  cout<<l<<endl;
  getch();
  }