Loop control structure022

Write a program to print all perfect number from 1 to 1000.

#include <stdio.h>
#include <conio.h>

void main ( )
{
               int   i,    a, b, c, sum = 0;
               clrscr ( );
                           
               printf ("\n\t LIST OF PERFECT NUMBER FROM 1 TO 1000\n\n\n");
               printf ("\t\t");
                                 
               for(a=1;a<=1000;a++)
               {               
                             sum=0;
                             for ( b = 1; b < a; b++ )
                             {                       
                                              c = a % b;
                                              if ( c == 0)
                                              {             
                                                        sum = sum + b;
                                              }
                             }
                             if ( a == sum)
                                       printf (" %d ",a);
               }
               getch ( );
}

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