The "long int" data type is used to represent long integers. The signed range of the "long int" datatype is between -2147483648 to 2147483647 and the unsigned range is between 0 to 4294967295.

   #include <iostream.h>
   void main()
   {
     unsigned long int l = 31356;
     signed long int s = -31455;
     cout << "Unsigned long integer is:" << l <<'\n';
     cout << "Bytes used by unsigned long int is:"<< 
             sizeof(l) <<'\n';
     cout << "signed long integer is:" << s <<'\n';
     cout << "Bytes used by signed long int is:" << 
             sizeof(s);
    }	

 Unsigned long integer is:31356
 Bytes used by unsigned long int is:4
 signed long integer is:-31455
 Bytes used by signed long int is:4

In the above example both signed,unsigned values are displayed along with bytes occupied by the "long int" data type.