Perfect Number Program in C || C Programs

In mathematics, a perfect number is a positive integer that is equal to the sum of its positive divisors, excluding the number itself.

For example, 6 is a positive number that is completely divisible by 1, 2, and 3. We know that the number is also divisible by itself but we will include it in the addition of divisors. When we add these divisors (1 + 2 + 3 = 6), it produces 6, which is equal to the number that we have considered. So, we can say that 6 is a perfect number.

Code -

/*C program to check whether the given number is the Perfect number*/ 
void main()  
// declare and initialize the variables 
int num, rem, sum = 0, i;  
// take an input from the user. 
printf("Enter a number\n");  
scanf("%d", &num);      
// find all divisors and add them 
for(i = 1; i < num; i++)  
                              rem = num % i;  
 if (rem == 0)  
                                               sum = sum + i;  
if (sum == num)  
                      printf(" %d is a Perfect Number");  
                      printf("\n %d is not a Perfect Number");  

Output -

Enter a Number
Entered Number is a Perfect Number

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