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  1. //Q42. Write a program to check if a number is a perfect number.
  2.  
  3. #include <stdio.h>
  4.  
  5. int main() {
  6.     int num, sum = 0;
  7.     printf("Enter a number:\n ");
  8.     scanf("%d", &num);
  9.  
  10.     for (int i = 1; i <= num / 2; i++) {
  11.         if (num % i == 0)
  12.             sum += i;
  13.     }
  14.  
  15.     if (sum == num)
  16.         printf("%d is a Perfect Number\n", num);
  17.     else
  18.         printf("%d is NOT a Perfect Number\n", num);
  19.  
  20.     return 0;
  21. }
  22.  
Success #stdin #stdout 0.01s 5316KB
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stdin
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6
stdout
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Enter a number:
 6 is a Perfect Number
https://ideone.com/CAtcv4
language:
C (gcc 8.3)
created:
6 days ago
visibility:
public

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