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a guest Jan 14th, 2020 74 Never
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  1. #include <iostream>
  2. #include <string>
  3.  
  4. using namespace std;
  5.  
  6. void changeCase(string &s)
  7. {
  8.     for (int i = 0; i < s.length(); i++)
  9.     {
  10.         if (s[i] >= 'a' && s[i] <= 'z')
  11.         {
  12.             s[i] = (s[i] - 'a' + 'A');
  13.         }
  14.         else if (s[i] >= 'A' && s[i] <= 'Z')
  15.         {
  16.             s[i] = (s[i] - 'A' + 'a');
  17.         }
  18.     }
  19. }
  20.  
  21. int main()
  22. {
  23.     string s;
  24.     cin >> s;
  25.     changeCase(s);
  26.     cout << s;
  27. }
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