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  1. #include <iostream>
  2. using namespace std;
  3.  
  4. int main() {
  5.     unsigned int number;
  6.     int digits = 0;
  7.  
  8.     cout << "enter a natural number: ";
  9.     cin >> number;
  10.  
  11.     if (number == 0) {
  12.     	digits = 1;
  13.     } else {
  14.     	unsigned int temp = number;
  15.     	while (temp > 0) {
  16.     		temp = temp / 10;
  17.     		digits++;
  18.     	}
  19.     }
  20.     cout << "the number " << number << " has " << digits << " digits.";
  21. 	return 0;
  22. }
Success #stdin #stdout 0.01s 5280KB
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Standard input is empty
stdout
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enter a natural number: the number 21909 has 5 digits.
https://ideone.com/cFkp96
language:
C++ (gcc 8.3)
created:
3 days ago
visibility:
public

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