C program to print perfect numbers from 1 to 100

#include
int main(){
 int n,i,sum;

 printf("Perfect numbers are: ");
 for(n=1;n<=100;n++){
   i=1;
   sum = 0;

   while(i<n){
     if(n%i==0)
          sum=sum+i;
         i++;
   }

   if(sum==n)
     printf("%d ",n);
 }

 return 0;
}

Perfect number is a positive number which sum of all positive divisors excluding that number is equal to 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

Note: 6 is the smallest perfect number.

Next perfect number is 28 since 1+ 2 + 4 + 7 + 14 = 28
Some more perfect numbers: 496, 8128