Address white_house{
    .street = "1600 Pennsylvania Avenue NW",
    .city = "Washington",
    .state = "District of Columbia",
    .zip = 20500,
  };

For me this is the most important initialization in C that helps with clarity so much, I used mostly structs to have function parameters intialized like this

However C++ had at time no default initialization for unmentioned fields, so in 2017 I had to remove it when converting the code to C++