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  1. #include <iostream>
  2. #include <cctype>
  3. #include <cstring>
  4. using namespace std;
  5.  
  6. void toLowerCase(char* str) {
  7.     for (int i = 0; str[i] != '\0'; ++i) {
  8.         str[i] = tolower(str[i]);
  9.     }
  10. }
  11.  
  12. void toUpperCase(char* str) {
  13.     for (int i = 0; str[i] != '\0'; ++i) {
  14.         str[i] = toupper(str[i]);
  15.     }
  16. }
  17.  
  18. void capitalizeWords(char* str) {
  19.     bool capitalize = true;
  20.     for (int i = 0; str[i] != '\0'; ++i) {
  21.         if (isspace(str[i])) {
  22.             capitalize = true;
  23.         }
  24.         else if (capitalize) {
  25.             str[i] = toupper(str[i]);
  26.             capitalize = false;
  27.         }
  28.         else {
  29.             str[i] = tolower(str[i]);
  30.         }
  31.     }
  32. }
  33.  
  34. void normalizeString(char* str) {
  35.     int n = strlen(str);
  36.     int j = 0;
  37.     bool inWord = false;
  38.  
  39.     for (int i = 0; i < n; ++i) {
  40.         if (!isspace(str[i])) {
  41.             if (inWord && j > 0 && str[j - 1] == ' ') str[j++] = ' ';
  42.             str[j++] = str[i];
  43.             inWord = true;
  44.         }
  45.         else if (inWord) {
  46.             str[j++] = ' ';
  47.             inWord = false;
  48.         }
  49.     }
  50.     if (j > 0 && str[j - 1] == ' ') --j;
  51.     str[j] = '\0';
  52. }
  53.  
  54. int main() {
  55.     char input[100];
  56.     cout << "Nhap chuoi: ";
  57.     cin.getline(input, 100);
  58.  
  59.     char temp[100];
  60.  
  61.     void (*functions[])(char*) = { toLowerCase, toUpperCase, capitalizeWords, normalizeString };
  62.     const char* descriptions[] = { "Ky tu thuong", "Ky tu hoa", "Viet hoa moi tu", "Chuan hoa" };
  63.  
  64.     for (int i = 0; i < 4; ++i) {
  65.         strcpy(temp, input);
  66.         functions[i](temp);
  67.         cout << descriptions[i] << ": " << temp << endl;
  68.     }
  69.  
  70.     return 0;
  71. }
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: Ky tu thuong: 
Ky tu hoa: 
Viet hoa moi tu: 
Chuan hoa:
https://ideone.com/Vt8wDL
language:
C++ 4.3.2 (gcc-4.3.2)
created:
56 days ago
visibility:
public

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