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  1. #include <iostream>
  2. #include <string>
  3. using namespace std;
  4.  
  5. string replace_num_with_x(const string &str);
  6.  
  7. int main() {
  8.     cout << "Please enter a line of text:";
  9.     string str;
  10.     getline(cin, str);
  11.     cout << replace_num_with_x(str);
  12. }
  13.  
  14. string replace_num_with_x(const string &str) {
  15.     string word, result;
  16.     string::size_type str_size = str.size(), start = 0, end;
  17.  
  18.     do {
  19.         end = str.find(' ', start);
  20.         if (end == string::npos) {
  21.             word = str.substr(start);
  22.             start = str_size;
  23.         }
  24.         else {
  25.             word = str.substr(start, end - start);
  26.             start = end + 1;
  27.         }
  28.  
  29.         bool all_digits = true;
  30.         string::size_type word_size = word.size();
  31.  
  32.         for (string::size_type i = 0; i < word_size; ++i) {
  33.             if (word[i] < '0' || word[i] > '9') {
  34.                 all_digits = false;
  35.                 break;
  36.             }
  37.         }
  38.  
  39. 		if (!result.empty()) {
  40. 			result += ' ';
  41. 		}
  42.  
  43.         if (all_digits) {
  44.             result.append(word_size, 'x');
  45.         } else {
  46.             result += word;
  47.         }
  48.     }
  49.     while (start < str_size);
  50.  
  51.     return result;
  52. }
Success #stdin #stdout 0s 4972KB
comments (?)
stdin
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My userID is john17 and my 4 digit pin is 1234 which is secret
stdout
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Please enter a line of text:My userID is john17 and my x digit pin is xxxx which is secret
https://ideone.com/qVhWNB
language:
C++ 4.3.2 (gcc-4.3.2)
created:
4 years ago
visibility:
public

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