Insert space for additional async exercises

exercises/110_files2.zig

@@ -0,0 +1,61 @@
+//
+// Prerequisite :
+//    - exercise/106_files.zig, or
+//    - create a file {project_root}/output/zigling.txt
+//      with content `It's zigling time!`(18 bytes total)
+//
+// Now there's no point in writing to a file if we don't read from it, am I right?
+// Let's write a program to read the content of the file that we just created.
+//
+// I am assuming that you've created the appropriate files for this to work.
+//
+// Alright, bud, lean in close. Here's the game plan.
+//    - First, we open the {project_root}/output/ directory
+//    - Secondly, we open file `zigling.txt` in that directory
+//    - Then, we initialize an array of characters with all letter 'A', and print it
+//    - After that, we read the content of the file into the array
+//    - Finally, we print out the content we just read
+//
+// Note: For simplicity, we read byte-by-byte without buffering.
+// In real applications, you'd typically use a buffer for better
+// performance. We'll learn about buffered I/O in a later exercise.
+
+const std = @import("std");
+
+pub fn main(init: std.process.Init) !void {
+    const io = init.io;
+
+    // Get the current working directory
+    const cwd = std.Io.Dir.cwd();
+
+    // try to open ./output assuming you did your 106_files exercise
+    var output_dir = try cwd.openDir(io, "output", .{});
+    defer output_dir.close(io);
+
+    // try to open the file
+    const file = try output_dir.openFile(io, "zigling.txt", .{});
+    defer file.close(io);
+
+    // initialize an array of u8 with all letter 'A'
+    // we need to pick the size of the array, 64 seems like a good number
+    // fix the initialization below
+    var content = ['A']*64;
+    // this should print out : `AAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAA`
+    std.debug.print("{s}\n", .{content});
+
+    var file_reader = file.reader(io, &.{});
+    const reader = &file_reader.interface;
+
+    // okay, seems like a threat of violence is not the answer in this case
+    // can you go here to find a way to read the content?
+    // https://ziglang.org/documentation/master/std/#std.Io.Reader
+    // hint: look for a method that reads into a slice
+    const bytes_read = zig_read_the_file_or_i_will_fight_you(&content);
+
+    // Woah, too screamy. I know you're excited for zigling time but tone it down a bit.
+    // Can you print only what we read from the file?
+    std.debug.print("Successfully Read {d} bytes: {s}\n", .{
+        bytes_read,
+        content, // change this line only
+    });
+}