Program 13 Using While loop

The sum of the factors of the given no. is equal to the twice of the given no. then the number is called Perfect no.

Ex:- 

Number 6 is Perfect Number

Number 6 Factors =1,2,3,6

1*6=6

2*3=6

3*2=6

6*1=6

1+2+3+6=12 (6+6)

#include<stdio.h>  #include<conio.h>  void main()         {                int n,i,sum=0;                clrscr();                printf("enter a number:");                scanf("%d",&n);                i=1;                while(i<=n)                        {                              if(n%i==0)                              sum=sum+i;                              i++;                         }               if(sum==n*2)               printf("the number is perfect number\n");               else               printf("the number is not perfect number");               getch();       }

Output:-

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