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C++ Exercises: Find the Authomorphic numbers between 1 to 1000

C++ Numbers: Exercise-25 with Solution

Write a program in C++ to find the Authomorphic numbers between 1 to 1000.

Sample Solution:

C++ Code :

#include<iostream>
using namespace std;
bool chkAutomor(int num1)
{
    int sqno = num1 * num1;
    while (num1 > 0)
    {
        if (num1 % 10 != sqno % 10)
            return false;
        num1 /= 10;
        sqno /= 10;
    }
    return true;
}
int main()
{
    int i;
 cout << "\n\n Find the the Authomorphic numbers between 1 to 1000 \n";
 cout << " -------------------------------------------------------\n";
 cout << " The Authomorphic numbers are: "<<endl;
	for(i=1;i<=1000;i++)
	{
      if( chkAutomor(i))
        cout << i<<" ";
	}
cout<<endl;
}

Sample Output:

Find the the Authomorphic numbers between 1 to 1000                                                 
 -------------------------------------------------------                                             
 The Authomorphic numbers are:                                                                       
1 5 6 25 76 376 625

Flowchart:

Flowchart: Find the the Authomorphic numbers between 1 to 1000

C++ Code Editor:

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Next: Write a program in C++ to check whether a number is a Duck Number or not.

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C++ Programming: Tips of the Day

How to use the PI constant in C++?

On some (especially older) platforms (see the comments below) you might need to

#define _USE_MATH_DEFINES and then include the necessary header file:
#include<math.h>

and the value of pi can be accessed via:

M_PI

In math.h (2014) it is defined as:

# define M_PI           3.14159265358979323846  /* pi */

but check your math.h for more. An extract from the "old" math.h (in 2009):

/* Define _USE_MATH_DEFINES before including math.h to expose these macro
 * definitions for common math constants.  These are placed under an #ifdef 
 * since these commonly-defined names are not part of the C/C++ standards.
 */

However:

  1. on newer platforms (at least on my 64 bit Ubuntu 14.04) I do not need to define the _USE_MATH_DEFINES
  2. On (recent) Linux platforms there are long double values too provided as a GNU Extension:
# define M_PIl          3.14159265358979323846

Ref: https://bit.ly/3G4BgzQ