clang-format

tutorial/c++/t1.cpp

tutorial/c++/t10.cpp

tutorial/c++/t11.cpp

tutorial/c++/t13.cpp

tutorial/c++/t14.cpp

tutorial/c++/t15.cpp

tutorial/c++/t16.cpp

tutorial/c++/t17.cpp

tutorial/c++/t18.cpp

tutorial/c++/t19.cpp

tutorial/c++/t2.cpp

tutorial/c++/t20.cpp

tutorial/c++/t21.cpp

tutorial/c++/t3.cpp

tutorial/c++/t4.cpp

tutorial/c++/t5.cpp

tutorial/c++/t6.cpp

tutorial/c++/t7.cpp

tutorial/c++/t8.cpp

tutorial/c++/t9.cpp