// fig19_20.cpp 
// C++20 text-formatting presentation types.
#include <format>
#include <iostream>

int main() {
   // floating-point presentation types
   std::cout << "Display 17.489 with default, .1 and .2 precisions:\n"
      << std::format("f: {0:f}\n.1f: {0:.1f}\n.2f: {0:.2f}\n\n", 17.489);

   std::cout << "Display 10000000000000000.0 with f, e, g and a\n"
      << std::format("f: {0:f}\ne: {0:e}\ng: {0:g}\na: {0:a}\n\n", 
            10000000000000000.0);

   // integer presentation types; # displays a base prefix
   std::cout << "Display 100 with d, #b, #o and #x:\n"
      << std::format(
            "d: {0:d}\n#b: {0:#b}\n#o: {0:#o}\n#x: {0:#x}\n\n", 100);

   // character presentation type
   std::cout << "Display 65 and 97 with c:\n"
      << std::format("{:c} {:c}\n\n", 65, 97);

   // string presentation type
   std::cout << "Display \"hello\" with s:\n" 
      << std::format("{:s}\n", "hello");
}


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