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void runEratosthenesSieve(int upperBound) {
      int upperBoundSquareRoot = (int)sqrt((double)upperBound);
      bool *isComposite = new bool[upperBound + 1];
      memset(isComposite, 0, sizeof(bool) * (upperBound + 1));
      for (int m = 2; m <= upperBoundSquareRoot; m++) {
            if (!isComposite[m]) {
                  cout << m << " ";
                  for (int k = m * m; k <= upperBound; k += m)
                        isComposite[k] = true;
            }
      }
      for (int m = upperBoundSquareRoot; m <= upperBound; m++)
            if (!isComposite[m])
                  cout << m << " ";
      delete [] isComposite;
}

prog.cpp: In function ‘void runEratosthenesSieve(int)’:
prog.cpp:2:62: error: ‘sqrt’ was not declared in this scope
       int upperBoundSquareRoot = (int)sqrt((double)upperBound);
                                                              ^
prog.cpp:4:61: error: ‘memset’ was not declared in this scope
       memset(isComposite, 0, sizeof(bool) * (upperBound + 1));
                                                             ^
prog.cpp:7:19: error: ‘cout’ was not declared in this scope
                   cout << m << " ";
                   ^~~~
prog.cpp:14:19: error: ‘cout’ was not declared in this scope
                   cout << m << " ";
                   ^~~~

Standard output is empty