Structing

#include <iostream>
#include <iomanip>
#include <string>
#include <ranges>

struct test {
  uint32_t ID;
  std::string name;

  struct point {
    double xx;
    double yy;
    double zz;
  } point;
};

struct testing {
  uint32_t ID;
  std::string name;

  struct point {
    double xx;
    double yy;
    double zz;
  } point;

  testing(uint32_t ID_ = 0u,
          std::string name_ = "",
          double xx_ = 0.0, double yy_ = 0.0, double zz_ = 0.0)
  : ID { ID_ }, name { name_ }, point { .xx = xx_, .yy = yy_, .zz = zz_ } {}
};

int main(int argc, char const * argv[]) {
  auto testpt = [](test const & tt) {
    std::cout << std::fixed << std::setprecision(3);
    std::cout << std::setw(3)  << tt.ID
              << std::setw(15) << tt.name
              << std::setw(7)  << tt.point.xx
              << std::setw(7)  << tt.point.yy
              << std::setw(7)  << tt.point.zz
              << '\n';
  };

  auto testingpt = [](testing const & tt) {
    std::cout << std::fixed << std::setprecision(3);
    std::cout << std::setw(3)  << tt.ID
              << std::setw(15) << tt.name
              << std::setw(7)  << tt.point.xx
              << std::setw(7)  << tt.point.yy
              << std::setw(7)  << tt.point.zz
              << '\n';
  };

  test t1 { 90u, "Test 90", { 8.4, 2.5, 9.9, } };
  testpt(t1);

  test t2 { .ID = 91u, .name = "Test 91", .point = { 7.3, 1.4, 8.8, } };
  testpt(t2);

  test t3 { .ID = 92u, .name = "Test 92", .point = { .xx = 6.1, .yy = 0.3, . zz = 7.7, } };
  testpt(t3);

  test t4 { 93u, "Test 03", 5.0, -0.2, 6.6, };
  testpt(t4);

  testing s0;   //  take defaults
  s0.name = "Testing 500";
  s0.point.yy = 11.02;
  testingpt(s0);

  testing s1(501u, "Testing 501", 11.1, 12.2, 13.3);
  testingpt(s1);

  return 0;
}