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C++ Exercises: Find the sum of first and last digit of a number

C++ For Loop: Exercise-57 with Solution

Write a program in C++ to find the sum of first and last digit of a number.

Pictorial Presentation:

C++ Exercises: Find the sum of first and last digit of a number

Sample Solution:-

C++ Code :

#include <iostream>
using namespace std;

int main()
{
   int n,first,last,sum;
    cout << "\n\n Find the sum of first and last digit of a number:\n";
    cout << "------------------------------------------------------\n";
    cout << " Input any number: ";
    cin >> n;
    first = n;
	last=n % 10;
	for(first=n;first>=10;first=first/10);
    cout<<" The first digit of "<<n<<" is: "<<first<<endl;
    cout<<" The last digit of "<<n<<" is: "<<last<<endl;
	cout<<" The sum of first and last digit of "<<n<<" is: "<<first+last<<endl;
}

Sample Output:

 Find the sum of first and last digit of a number:                     
------------------------------------------------------                 
 Input any number: 12345                                               
 The first digit of 12345 is: 1                                        
 The last digit of 12345 is: 5                                         
 The sum of first and last digit of 12345 is: 6 

Flowchart:

Flowchart: Find the sum of first and last digit of a number

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