Answer :

#include<stdio.h>   //header file contains the function,decleraction and macro defination of key words used in code.

int main ()

{

int num,i,sum=0;  //adressing the variables

printf("Enter the you want to check that it is perfect or not : ");  //output

scanf("%d",&num);

for (i=1;i<num;i++) //condition

{

if (num%i==0)  //condition

{

sum=sum+i;

}

}

if (sum==num) //condition

{

printf("%d is the perfect number ",num);  //output

} 

else 

{

printf("%d is not the perfect number ",num);  //output

}

}

Output :