106 & 107

exercises/106_files.zig

@@ -35,9 +35,7 @@ pub fn main() !void {
         // by doing nothing
         //
         // we want to catch error.PathAlreadyExists and do nothing
-        ??? => {
-            ???;
-        },
+        ??? => {},
         // if is any other unexpected error we just propagate it through
         else => return e,
     };
@@ -46,7 +44,8 @@ pub fn main() !void {
     // wait a minute
     // opening a directory might fail!
     // what should we do here?
-    const output_dir: std.fs.Dir = cwd.openDir("output", .{});
+    var output_dir: std.fs.Dir = cwd.openDir("output", .{});
+    defer output_dir.close();
 
     // we try to open the file `zigling.txt`,
     // and propagate the error up if there are any errors
@@ -60,7 +59,7 @@ pub fn main() !void {
 
     // !you are not allow to switch this two lines to before file closing line!
     const byte_written = try file.write("It's zigling time!");
-    std.debug.print("Succefully wrote {} bytes.\n", .{byte_written});
+    std.debug.print("Successfully wrote {} bytes.\n", .{byte_written});
 }
 // to check if you actually write to the file, you can either,
 // 1. open the file on your text editor, or

exercises/107_files2.zig

@@ -0,0 +1,52 @@
+//
+// Prerequisite :
+//    - exercise/106_files.zig, or
+//    - create a file {project_root}/output/zigling.txt
+//      with content `It's zigling time!`(18 byte total)
+//
+// Now there no point in writing to a file if we don't read from it am I right?
+// let's wrote a program to read the content of the file that we just created.
+//
+// I am assuming 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 initalize an array of character with all letter 'A', and print it
+//    - Afte that, we read the content of the file to the array
+//    - Finally, we print out the read content
+
+const std = @import("std");
+
+pub fn main() !void {
+    // Get the current working directory
+    const cwd = std.fs.cwd();
+
+    // try to open ./output assuming you did your 106_files exercise
+    var output_dir = try cwd.openDir("output", .{});
+    defer output_dir.close();
+
+    // try to open the file
+    const file = try output_dir.openFile("zigling.txt", .{});
+    defer file.close();
+
+    // initalize an array of u8 with all letter 'A'.
+    // we need to pick a size of the array, 64 seems like a good number.
+    // fix the initalization below
+    var content = ['A']*64;
+    // this should print out : `AAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAA`
+    std.debug.print("{s}\n", .{content});
+
+    // okay, seem like 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.fs.File
+    // hint: you might find two answer that are both vaild in this case
+    const byte_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 {} byte: {s}\n", .{
+        byte_read,
+        content, // change this line only
+    });
+}