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

**#include<iostream.h>****#include<conio.h>****void main() //Start of main****{****clrscr();****int i=1, u=1, sum=0;****while(i<=500)****{ // start of first loop.****while(u<=500)****{ //start of second loop.****if(u<i)****{****if(i%u==0 )****sum=sum+u;****} //End of if statement****u++;****} //End of second loop****if(sum==i)****{****cout<<i<<" is a perfect number."<<"\n";****}****i++;****u=1; sum=0;****} //End of First loop****getch();****} //End of main**

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.
In APL: isPerfect←{⍵=+/(⍳⍵-1){(0=⍺|⍵)/⍺}⍵}

ReplyDeleteisPerfect 28

1

hi

DeleteAlso...

ReplyDelete{⍵ if isPerfect ¨⍵}⍳500

6 28 496

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Try To Practice As Much As You Can.

Practice is Very Important For Your Solid Base to Learn Programming.. Good Luck

#include

ReplyDeleteusing namespace std;

int main()

{

int num,perfect;

int per=0;

cout<<"enter number \n";

cin>>num;

int newnum=num;

for(int i=1;i<=num;i++){

if(num%i == 0){

perfect=i;

cout<<perfect<<endl;

per=per+perfect;

}

}

if(newnum == per/2){

cout<<"perfect";

}else{

cout<<"not perfect";

}

}

This comment has been removed by the author.

ReplyDeleteA.o.A Fahad ..

ReplyDeleteYour website is really really helping. I am a beginner in C++.I have made a more simplest logic for perfect numbers and it works.

#include

#include

using namespace std;

int main()

{

int a,b,c;

c=0;

cout<<"Plz enter a number :";

cin>>b;

for(a=1;a<b;a++)

{

if(b%a==0)

c=c+a;

}

if(c==b)

cout<<"Yes it is a Perfect number";

else

cout<<"No it is not a perfect number";

getch();

}

what is using namespace std

Deletethis doesn't work for 6

Deletewhat is if and if else statement

ReplyDeleteconditions..

DeleteThis comment has been removed by the author.

ReplyDeleteThis comment has been removed by the author.

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