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  1. #include <stdio.h>
  2.  
  3. int isPerfect(int x) {
  4.     int i, sum = 0;
  5.     for (i = 1; i < x; i++) {
  6.         if (x % i == 0)
  7.             sum += i;
  8.     }
  9.     return sum == x;
  10. }
  11.  
  12. int main() {
  13.     int x;
  14.     printf("Enter x: ");
  15.     scanf("%d", &x);
  16.     if (isPerfect(x))
  17.         printf("%d is a Perfect Number: True\n", x);
  18.     else
  19.         printf("%d is a Perfect Number: False\n", x);
  20.     return 0;
  21. }
Success #stdin #stdout 0s 5316KB
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stdin
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6
stdout
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Enter x: 6 is a Perfect Number: True
https://ideone.com/qsdTmH
language:
C (gcc 8.3)
created:
12 hours ago
visibility:
public

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