determining perfect number using functions

#include <stdio.h>
int func(int a){
    int sum=0;
    
        for(int i=1;i<a;i++){
            if(a%i==0){
                
                sum=sum+i;
            }
            
        }
        
        if(sum==a){
            printf("perfect");
        }
        else{
            printf(" not perfect");
            
        }
    }
   

int main()
{

    int n;
    printf("enter the number to find it is perfect or not : ");
    scanf("%d",&n);
    func(n);
    

    return 0;
}