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C++ Exercises: Find the number and sum of all integer between 100 and 200 which are divisible by 9

C++ For Loop: Exercise-28 with Solution

Write a program in C++ to find the number and sum of all integer between 100 and 200 which are divisible by 9.

Pictorial Presentation:

C++ Exercises: Find the number and sum of all integer between 100 and 200 which are divisible by 9

Sample Solution:-

C++ Code :

#include <iostream>
using namespace std;

int main()
{
    int i, sum = 0;
    cout << "\n\n Find the number and sum of all integer between 100 and 200, divisible by 9:\n";
    cout << "--------------------------------------------------------------------------------\n";
    cout << " Numbers between 100 and 200, divisible by 9: " << endl;
    for (i = 101; i < 200; i++) 
    {
        if (i % 9 == 0) 
        {
            cout << " " << i;
            sum += i;
        }
    }
    cout << "\n The sum : " << sum << endl;
}

Sample Output:

 Find the number and sum of all integer between 100 and 200, divisible by 9:                                                                  
--------------------------------------------------------------------------------                                                              
 Numbers between 100 and 200, divisible by 9:                          
 108 117 126 135 144 153 162 171 180 189 198                           
 The sum : 1683 

Flowchart:

Flowchart: Find the number and sum of all integer between 100 and 200 which are divisible by 9

C++ Code Editor:

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C++ Programming: Tips of the Day

What is a smart pointer and when should I use one?

This answer is rather old, and so describes what was 'good' at the time, which was smart pointers provided by the Boost library. Since C++11, the standard library has provided sufficient smart pointers types, and so you should favour the use of std::unique_ptr, std::shared_ptr and std::weak_ptr.

There was also std::auto_ptr. It was very much like a scoped pointer, except that it also had the "special" dangerous ability to be copied - which also unexpectedly transfers ownership.

It was deprecated in C++11 and removed in C++17, so you shouldn't use it.

std::auto_ptr<MyObject> p1 (new MyObject());
std::auto_ptr<MyObject> p2 = p1; // Copy and transfer ownership. 
                                 // p1 gets set to empty!
p2->DoSomething(); // Works.
p1->DoSomething(); // Oh oh. Hopefully raises some NULL pointer exception.

Ref : https://bit.ly/3mc9GHE