C++ Exercises: Display the operation of pre and post increment and decrement

C++ Basic: Exercise-9 with Solution

Write a C++ program to display the operation of pre and post increment and decrement.

Sample Solution:

C++ Code :

#include <iostream>
using namespace std;
 
int main() 
{
   int num = 57;      
    cout << "\n\n Display the operation of pre and post increment and decrement :\n";
	cout << "--------------------------------------------------------------------\n";    
   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;
}

Sample Output:

 Display the operation of pre and post increment and decrement :       
--------------------------------------------------------------------   
 The number is : 57                                                    
 After post increment by 1 the number is : 58                          
 After pre increment by 1 the number is : 59                           
 After increasing by 1 the number is : 60                              
 After post decrement by 1 the number is : 59                          
 After pre decrement by 1 the number is : 58                           
 After decreasing by 1 the number is : 57 

Flowchart:

C++ Code Editor:

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