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  1. #include <stdio.h>
  2. #include <math.h>
  3.  
  4. int main() {
  5.     int num, originalNum, remainder, result = 0, n = 0;
  6.  
  7.     printf("Enter a number: ");
  8.     scanf("%d", &num);
  9.  
  10.     originalNum = num;
  11.  
  12.     // Count number of digits
  13.     while (originalNum != 0) {
  14.         originalNum /= 10;
  15.         ++n;
  16.     }
  17.  
  18.     originalNum = num;
  19.  
  20.     // Calculate sum of digits raised to power n
  21.     while (originalNum != 0) {
  22.         remainder = originalNum % 10;
  23.         result += pow(remainder, n);
  24.         originalNum /= 10;
  25.     }
  26.  
  27.     if (result == num)
  28.         printf("%d is an Armstrong number.\n", num);
  29.     else
  30.         printf("%d is not an Armstrong number.\n", num);
  31.  
  32.     return 0;
  33. }
  34.  
Success #stdin #stdout 0.01s 5288KB
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stdin
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Standard input is empty
stdout
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Enter a number: 21857 is not an Armstrong number.
https://ideone.com/YJ1l8x
language:
C (gcc 8.3)
created:
1 day ago
visibility:
public

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