Here in this program, we will write a code which checks whether the entered number is a Perfect number or not.

**What is a Perfect number?**

When a positive integer is equal to the sum of its all possible divisors except itself, is known as a perfect number.

For example, 6 is a perfect number because the sum of its all divisors is equal to 6

Divisors of 6 are 1, 2, 3 exclude 6.

Sum of 6 all divisors = 1+2+3 = 6

**Statements to use:**

- For loop
- If statements
- Else statement

**Steps:**

- First, we will ask the user to enter a positive integer
- Then we start a loop from 1 to the half of the entered number
- Inside the loop, we will check which number is the divisor of the entered number.
- If the number is a divisor of the entered number, we will sum it.
- At last, we will check whether the summing of all the divisors is equal to the entered number or not
- If it is equal to the entered number, we will print It is a perfect number, is not we will print it is not a perfect number.

**Perfect Number in C**

#include<stdio.h> #include<conio.h> void main() { int num, sum=0,i; clrscr(); printf("Enter a Positive Integer: "); scanf("%d",&num); if (num==1) { printf("It is not a Perfect number"); } else { for(i=1;i<=num/2;i++) { if(num%i==0) sum+=i; } if(sum==num) printf("It is a perfect number"); else printf("It is not a perfect number"); } getch(); }

**Output:**

Enter a Positive Integer: 6

It is a perfect number

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