foo.cc: In constructor ‘ComplexArray::ComplexArray()’:
foo.cc:49:26: warning: unused variable ‘c’ [-Wunused-variable]
   49 |                 Complex* c = new Complex[100];
      |                          ^
foo.cc: In constructor ‘ComplexArray::ComplexArray(int)’:
foo.cc:54:26: warning: unused variable ‘c’ [-Wunused-variable]
   54 |                 Complex* c = new Complex[100];
      |                          ^
foo.cc: In member function ‘void ComplexArray::Sort()’:
foo.cc:69:42: warning: suggest parentheses around comparison in operand of ‘==’ [-Wparentheses]
   69 |                                 if (c[j] < c[j + 1] == false)
      |                                     ~~~~~^~~~~~~~~~
foo.cc: In member function ‘bool Complex::operator<(Complex)’:
foo.cc:24:9: warning: control reaches end of non-void function [-Wreturn-type]
   24 |         }
      |         ^