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C++ Exercises: Check whether a given number is an Ugly number or not

C++ Numbers: Exercise-1 with Solution

Write a program in C++ to check whether a given number is an Ugly number or not.

Pictorial Presentation:

C++ Exercises: Check whether a given number is an Ugly number or not

Sample Solution:

C++ Code :

# include <iostream>
# include <string>
using namespace std;
int main()
{
int n,x=0;
 cout << "\n\n Check whether a given number is an Ugly number:\n";
 cout << "----------------------------------------------------\n";
cout << "Input an integer number: ";
cin >> n;
      if (n <= 0) {  
            cout <<"Input a correct number.";  
        }
       while (n != 1) 
       {  
            if (n % 5 == 0) 
            {  
                n /= 5;  
            } 
            else if (n % 3 == 0) 
            {  
                n /= 3;  
            } 
            else if (n % 2 == 0) 
            {  
                n /= 2;  
            } 
            else 
            {  
                cout <<"It is not an Ugly number."<<endl; 
                x = 1;  
                break;  
            }  
        } 
		        if (x==0)
		        { 
                cout <<"It is an Ugly number."<<endl;
                }
}

Sample Output:

Check whether a given number is an Ugly number:                       
----------------------------------------------------                   
Input an integer number: 25                                            
It is an Ugly number.

Flowchart:

Flowchart: Check whether a given number is an Ugly number or not

C++ Code Editor:

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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