assignment-p-03.c (854B)
1 /* Write a C program that includes a user-defined function named isPerfect with the signature 2 int isPerfect(int num);. A perfect number is a positive integer that is equal to the sum of 3 its proper divisors, excluding itself. For example, 28 is a perfect number because the sum 4 of its divisors (1, 2, 4, 7, 14) equals 28. */ 5 6 #include <stdio.h> 7 8 int isPerfect(int); 9 10 int main() 11 { 12 int n; 13 printf("Enter the number: "); 14 scanf("%d", &n); 15 if (isPerfect(n)) 16 { 17 printf("\nInput %d is a Perfect Number.", n); 18 } 19 else 20 { 21 printf("\nInput %d is not a Perfect Number.", n); 22 } 23 return 0; 24 } 25 26 int isPerfect(int n) 27 { 28 if (n <= 1) 29 return 0; 30 int temp = 1; 31 int i; 32 for (i = 2; i <= n / 2; i++) 33 { 34 if (n % i == 0) 35 { 36 temp += i; 37 } 38 } 39 return temp == n; 40 }