A-M baby

Task/File-size/D/file-size-1.d

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+import std.file;
+
+void main() {
+    auto len = getSize("data.txt");
+}

Task/File-size/D/file-size-2.d

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+import std.stdio, std.path, std.file, std.stream;
+// NB: mmfile can treat the file as an array in memory
+import std.mmfile;
+
+string[] generateTwoNames(string name) {
+    string cwd  = curdir ~ sep; // on current directory
+    string root = sep;          // on root
+
+    // remove path, left only basename
+    name = std.path.getBaseName(name);
+
+    // NB: in D ver.2, getBaseName is alias of basename
+    return [cwd ~ name, root ~ name];
+}
+
+void testsize(string fileName1) {
+    foreach (fileName2; generateTwoNames(fileName1)) {
+        try {
+            writefln("File %s has size:", fileName2);
+            writefln("%10d bytes by std.file.getSize (function),",
+                     std.file.getSize(fileName2));
+            writefln("%10d bytes by std.stream (class),",
+                     (new std.stream.File(fileName2)).size);
+            writefln("%10d bytes by std.mmfile (class).",
+                     (new std.mmfile.MmFile(fileName2)).length);
+        } catch (Exception e) {
+            writefln(e.msg);
+        }
+        writeln();
+    }
+}
+
+void main() {
+    testsize(r"input.txt");
+}