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  1. #include <iostream>
  2. #include <cctype>
  3. #include <ctime>
  4. #include <string>
  5.  
  6. int main()
  7. {
  8.     clock_t time;
  9.  
  10.     std::string str("qWeRtY uIoP[  ]A   SdfghJklk;'ZXcvbcxMMMBNBM,./dsadsdas");
  11.     std::string dump(str);
  12.  
  13.     time = clock();
  14.  
  15.     for (long i = 0; i < 2000000; ++i)
  16.     {
  17.         str = dump;
  18.         for (auto &c : str)
  19.         {
  20.             if (isalpha(c))
  21.                 c ^= 32;
  22.         }
  23.     }
  24.  
  25.     std::cout << (double)time / CLOCKS_PER_SEC << std::endl;
  26.  
  27.     time = clock();
  28.  
  29.     for (long i = 0; i < 2000000; ++i)
  30.     {
  31.         str = dump;
  32.         for (auto &c : str)
  33.         {
  34.             if (isalpha(c)) c ^= 32;
  35.         }
  36.     }
  37.  
  38.     std::cout << (double)time / CLOCKS_PER_SEC << std::endl;
  39.  
  40. }
Success #stdin #stdout 3.02s 3028KB
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https://ideone.com/xSXDFF
language:
C++14 (gcc 8.3)
created:
10 years ago
visibility:
public

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