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Consider the class/struct <tt>A1</tt> below.
<p>Try the various combinations of constructing an object using the <strong>default</strong> 
   constructor and an <string>initializing</string> constructor. </p>
<ol><li>With initializing ctor only (don't define any ctor in <tt>A1</tt>)</li>
   <li>With default constructor only (don't define any ctor in <tt>A1</tt>)</li>
   <li>Then define an initializing ctor and try to get <tt>obj2</tt> definition to compile </li>
   <li>Then define both a default and an initializing ctor and try to get both objects to compile </li>
   
   
</ol>
<p><strong>Learning goal:</strong> </p>
<ul><li>When does the compiler generate a default constructor and when does it not?</li>
   <li>What does the default constructor do?</li>
</ul>
Remarks
Comments, history, license, etc.
 
Copied from problem cpp/cs104/classes/constructor_init (author: redekopp@usc.edu)
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Engine
Template / Reference solution
 
#include <iostream>
#include <algorithm>
using namespace std;
struct A1 {
\[
REDACTED
\show:
   double x;
]\
};
int main()
{
\[
REDACTED
\show:
   // A1 obj1;
   // cout << "obj1's value of x: " << obj1.x << endl;
   A1 obj2(3.9);
   cout << "obj2's value of x: " << obj2.x << endl;
]\
   return 0;
}
C++ test suite
json list of stdin/args tests
e.g. [{"stdin":"hi", "args":["4", "5"]},
{"stdin":"noargs"}]

to just run once with no input use [{}]
 
[{}]
Is example?
i.e., just a demo
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Note: problems are open-source by default (see 'Public permissions'). Assumed license for open problems is Creative Commons 4.0 Attribution-ShareAlike unless specified in 'Remarks'.