#include <iostream.h>
 
int main() 
{
   int num = 57;      
    cout << " Display the operation of pre and post increment and decrement : ";
    cout << "-------------------------------------------------------------------- ";    
   cout <<" The number is : " << num << endl; 
   num++;               // increase by 1 (post-increment)
   cout <<" After post increment by 1 the number is : " << num << endl; 
   ++num;               // increase by 1 (pre-increment)
   cout <<" After pre increment by 1 the number is : " << num << endl; 
   num = num + 1;  // num is now increased by 1.
   cout <<" After increasing by 1 the number is : " << num << endl; // 79
   num--;               // decrease by 1 (post-decrement)
   cout <<" After post decrement by 1 the number is : " << num << endl; 
   --num;               // decrease by 1 (pre-decrement)
   cout <<" After pre decrement by 1 the number is : " << num << endl; 
   num = num - 1; // num is now decreased by 1.
   cout <<" After decreasing by 1 the number is : " << num << endl;
   cout << endl;
   return 0;
}