7.To check whether a number is perfect number or not

#include<stdio.h>
main()
{
int i,n,sum=0;
scanf("%d",&n);
for(i=1;i<n;i++)
{
 if(n%i==0)
    sum=sum+i;
}
if(n==sum)
printf("perfect number");
else
    printf("not perfect number");
return 0;
}