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C++ Exercises: Find Pronic Number between 1 to 1000

C++ Numbers: Exercise-23 with Solution

Write a program in C++ to find Pronic Number between 1 to 1000.

Sample Solution:

C++ Code :

#include<bits/stdc++.h>
using namespace std;

int main()
{
    int prno,i,n,flg;
 cout << "\n\n Find the Pronic Numbers between 1 to 1000: \n";
 cout << " -----------------------------------------------\n";
 cout << " The Pronic numbers are: "<<endl;
 for(prno=1;prno<=1000;prno++)
 {
     flg=0;
    for(i=1;i<=prno;i++)
        {
            if(i*(i+1)==prno) 
            {
            flg=1;
            break;
            }
        }
            if(flg==1)
            {
            cout << prno<<" ";
            }
 }
            cout << endl;
}

Sample Output:

 Find the Pronic Numbers between 1 to 1000:                                                          
 -----------------------------------------------                                                     
 The Pronic numbers are:                                                                             
2 6 12 20 30 42 56 72 90 110 132 156 182 210 240 272 306 342 380 420 462 506 552 600 650 702 756 812 
870 930 992

Flowchart:

Flowchart: Find Pronic Number between 1 to 1000

C++ Code Editor:

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Previous: Write a program in C++ to check whether a number is a Pronic Number or Heteromecic Number or not.
Next: Write a program in C++ to check if a number is Authomorphic 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