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  1. #include <iostream>
  2. #include <cctype>
  3. #include <string>
  4. using namespace std;
  5.  
  6. string toLowerCase(const string& str) {
  7.     string result = str;
  8.     for (char& ch : result) {
  9.         ch = tolower(ch);
  10.     }
  11.     return result;
  12. }
  13.  
  14. string toUpperCase(const string& str) {
  15.     string result = str;
  16.     for (char& ch : result) {
  17.         ch = toupper(ch);
  18.     }
  19.     return result;
  20. }
  21.  
  22. string capitalizeWords(const string& str) {
  23.     string result = str;
  24.     bool capitalize = true;
  25.     for (char& ch : result) {
  26.         if (isspace(ch)) {
  27.             capitalize = true;
  28.         } else if (capitalize) {
  29.             ch = toupper(ch);
  30.             capitalize = false;
  31.         } else {
  32.             ch = tolower(ch);
  33.         }
  34.     }
  35.     return result;
  36. }
  37.  
  38. string normalizeString(const string& str) {
  39.     string result;
  40.     bool inWord = false;
  41.     for (char ch : str) {
  42.         if (!isspace(ch)) {
  43.             if (inWord && !result.empty() && isspace(result.back())) {
  44.                 result += ' ';
  45.             }
  46.             result += ch;
  47.             inWord = true;
  48.         } else if (inWord) {
  49.             result += ' ';
  50.             inWord = false;
  51.         }
  52.     }
  53.     if (!result.empty() && isspace(result.back())) {
  54.         result.pop_back();
  55.     }
  56.     return result;
  57. }
  58.  
  59. int main() {
  60.     string input;
  61.     cout << "Nhap chuoi: ";
  62.     getline(cin, input);
  63.  
  64.     cout << "Chuoi ky tu thuong: " << toLowerCase(input) << endl;
  65.     cout << "Chuoi ky tu hoa: " << toUpperCase(input) << endl;
  66.     cout << "Chuoi viet hoa moi tu: " << capitalizeWords(input) << endl;
  67.     cout << "Chuoi chuan hoa: " << normalizeString(input) << endl;
  68.  
  69.     return 0;
  70. }
Success #stdin #stdout 0.01s 5280KB
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stdin
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Standard input is empty
stdout
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Nhap chuoi: Chuoi ky tu thuong: 
Chuoi ky tu hoa: 
Chuoi viet hoa moi tu: 
Chuoi chuan hoa:
https://ideone.com/cAMEQk
language:
C++ 4.3.2 (gcc-4.3.2)
created:
56 days ago
visibility:
public

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