import std.stdio; import std.algorithm; import std.range; /* a multiline comment * */ int the_ultimate_answer() {  return 42; } void main() {  // function call with string literal  writeln("Hello World!");  // an int array declaration  int[] arr1 = [1, 2, 3];  // a double  double d1 = 3.14;  // another function call   writefln("%s\n%s\n%s\n", arr1, d1, the_ultimate_answer()); }