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authorChris Boesch <chrboesch@noreply.codeberg.org>2026-04-03 13:35:56 +0200
committerChris Boesch <chrboesch@noreply.codeberg.org>2026-04-03 13:35:56 +0200
commite0259f43a726f61da14686de802021fcdb9aacd0 (patch)
tree57359102e5e898289b91ada2d65ca742ec118c8b /exercises/107_files2.zig
parentffde357f303e7459a12cfe4b785ae9e8ef9ebe30 (diff)
Insert space for additional async exercises
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-//
-// 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
- });
-}