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

C++ Numbers: Exercise-6 with Solution

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

Pictorial Presentation:

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

Sample Solution:

C++ Code :

#include <bits/stdc++.h>
using namespace std;
int getSum(int n)
{
    int sum = 0;
    for (int i=1; i<=sqrt(n); i++)
    {
        if (n%i==0)
        {
            if (n/i == i)
                sum = sum + i;
            else 
            {
                sum = sum + i;
                sum = sum + (n / i);
            }
        }
    }
    sum = sum - n;
    return sum;
}
bool checkDeficient(int n)
{
    return (getSum(n) < n);
}
int main()
{
int n;
 cout << "\n\n Check whether a given number is an Deficient number:\n";
 cout << " --------------------------------------------------------\n";
cout << " Input an integer number: ";
cin >> n;
    checkDeficient(n)? cout << " The number is Deficient.\n" : cout << " The number is not Deficient.\n";
    return 0;
}

Sample Output:

Check whether a given number is an Deficient number:                  
 --------------------------------------------------------              
 Input an integer number: 25                                           
 The number is Deficient.

Flowchart:

Flowchart: Check whether a given number is Deficient or not

C++ Code Editor:

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Previous: Write a program in C++ to find Perfect numbers and number of Perfect numbers between 1 to 1000.
Next: Write a program in C++ to find the Deficient numbers (integers) between 1 to 100.

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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