﻿ C++ Exercises: Input any number and print it in words - w3resource # C++ Exercises: Input any number and print it in words

## C++ For Loop: Exercise-60 with Solution

Write a program in C++ to input any number and print it in words.

Pictorial Presentation: Sample Solution:-

C++ Code :

``````#include <iostream>
using namespace std;
int main()
{
int n, num = 0, i;
cout << "\n\n Print a number in words:\n";
cout << "-----------------------------\n";
cout << " Input any number: ";
cin >> n;
while (n != 0) {
num = (num * 10) + (n % 10);
n /= 10;
}
for (i = num; i > 0; i = i / 10) {

switch (i % 10) {
case 0:
cout << "Zero ";
break;
case 1:
cout << "One ";
break;
case 2:
cout << "Two ";
break;
case 3:
cout << "Three ";
break;
case 4:
cout << "Four ";
break;
case 5:
cout << "Five ";
break;
case 6:
cout << "Six ";
break;
case 7:
cout << "Seven ";
break;
case 8:
cout << "Eight ";
break;
case 9:
cout << "Nine ";
break;
}
}
cout << endl;
}
``````

Sample Output:

``` Print a number in words:
-----------------------------
Input any number: 8309
Eight Three Zero Nine
```

Flowchart: 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