FIND THE PERFECT NUMBER IN C++

FIND THE PERFECT NUMBER IN C++
Di Posting Oleh : Simple Learning
Kategori : Find Perfect Number in C++ Finding Perfect Number Perfect Number C++ Perfect Number Program

What is a perfect number?

"Perfect number is a positive number which sum of all positive divisors excluding that number." 

For example 6 is Perfect Number since divisor of 6 are 1, 2 and 3. Sum of its divisor is

1 + 2+ 3 =6

and  28 is also a Perfect Number

 since 1+ 2 + 4 + 7 + 14= 28

Other perfect numbers: 496, 8128

CODE FOR PERFECT NUMBER IN C++

1. #include<iostream.h>
2. #include<conio.h>
3. void main()                 //Start of main
4. {
5.   clrscr();
6.    int i=1, u=1, sum=0;
7.    while(i<=500)
8.  {                                  // start of first loop.
9. 
   
10.    while(u<=500)
11.    {                               //start of second loop.
12.      if(u<i)
13.      {
14.       if(i%u==0 )
15.       sum=sum+u;
16.      }                          //End of if statement
17.     
18.      u++;
19.    }                           //End of second loop
20. 
    
21.    if(sum==i)
22.    {
23.     cout<<i<<" is a perfect number."<<"\n";
24.    }
25. 
    
26.    i++;
27.    u=1;  sum=0;
28.  }                             //End of First loop
29.    getch();
30.  }                            //End of main

Sample output

6 is a perfect number.

28 is a perfect number.

496 is a perfect number.

Note:

If you want to calculate perfect number within your desire limit simply take a variable and replaced 500 with it.

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