Changes in solutions are reflected to the exercises

exercises/24_file_io/file_io1.rs

@@ -12,9 +12,8 @@ fn main() {
             // TODO : What would be the expected text ?
             assert_eq!(, contents);
         }
-        Err(e) => {
+        Err(_) => {
-            eprintln!("Error reading file: {}", e);
+            panic!("Error reading file.");
-            assert!(false);
         }
     }
 }
@@ -22,8 +21,8 @@ fn main() {
 fn create_required_files() {
     let file_path = Path::new(TEST_FILE_NAME);
 
-    if file_path.exists() == false {
+    if !file_path.exists() {
-        fs::write(&file_path, "This is the file content.").unwrap();
+        fs::write(file_path, "This is the file content.").unwrap();
         println!("File created.");
     }
 }

exercises/24_file_io/file_io2.rs

@@ -1,4 +1,3 @@
-
 use std::fs;
 use std::io::{BufRead, BufReader, BufWriter, Write};
 use std::path::Path;
@@ -6,41 +5,41 @@ use std::path::Path;
 const TEST_FILE_NAME: &str = "MultiLineTextFile.txt";
 
 fn main() {
-
     create_required_files();
     let input_file = fs::File::open(TEST_FILE_NAME);
 
     if input_file.is_err() {
-        eprintln!("Input file open error : {}", input_file.as_ref().unwrap_err());
+        panic!("Input file open error");
-        assert!(false);
     }
 
-    // TODO : How to create a new BufReader using input file
+    let buffered_input_file = BufReader::new(input_file.unwrap());
-    let buffered_input_file =;
 
     let output_file = fs::File::create("MultiLineOutputFile.txt");
 
     if output_file.is_err() {
-        eprintln!("Output file open error : {}", output_file.as_ref().unwrap_err());
+        eprintln!(
-        assert!(false);
+            "Output file open error : {}",
+            output_file.as_ref().unwrap_err()
+        );
+        panic!("Output file open error");
     }
-    let mut buffered_file_writer = BufWriter::new(output_file.ok().unwrap());
+    // TODO : How to create a new BufReader using input file
+    let buffered_input_file =;
 
     let mut line_number = 1;
-    let mut lines = buffered_input_file.lines();
+
-    while let Some(line) = lines.next() {
+    for line in buffered_input_file.lines() {
         if let Ok(line) = line {
-            let write_result = buffered_file_writer.write(format!("Line {} : {}\n", line_number, line).as_bytes());
+            let write_result =
+                buffered_file_writer.write(format!("Line {} : {}\n", line_number, line).as_bytes());
             if write_result.is_err() {
                 eprintln!("Write result error: {}", write_result.unwrap_err());
                 break;
             }
             line_number += 1;
         } else {
-            eprintln!("Write line error : {}", line_number);
+            panic!("Write line error");
-            assert!(false);
         }
-
     }
 
     println!("{} : lines processed", line_number - 1);
@@ -49,12 +48,11 @@ fn main() {
 fn create_required_files() {
     let file_path = Path::new(TEST_FILE_NAME);
 
-    if file_path.exists() == false {
+    if !file_path.exists() {
         let text = "This is the first line of the text.
         This is the second line.
         And this is the third and the last line.";
-        fs::write(&file_path, text).unwrap();
+        fs::write(file_path, text).unwrap();
         println!("File created.");
     }
-
 }

exercises/24_file_io/file_io3.rs

@@ -1,8 +1,7 @@
 use std::fs;
-use std::path::{Path, PathBuf};
+use std::path::PathBuf;
 
 fn main() {
-
     create_required_files();
     let mut path_buffer = PathBuf::new();
 
@@ -18,15 +17,10 @@ fn main() {
         println!("File size {}", meta_data.len());
         assert_eq!(meta_data.len(), 117);
         println!("File permissions {:?}", meta_data.permissions());
-        assert_eq!(meta_data.permissions().readonly(), false);
+        assert!(!meta_data.permissions().readonly());
     } else {
-        println!("Could not get metadata");
+        panic!("Could not get metadata");
-        assert!(false);
     }
-
-
-
-
 }
 
 fn create_required_files() {
@@ -34,18 +28,16 @@ fn create_required_files(){
 
     let dir_path = file_path.parent().unwrap();
 
-    if dir_path.exists() == false {
+    if !dir_path.exists() {
         fs::create_dir(dir_path).unwrap();
         println!("Created directory {:?}", dir_path);
     }
 
-    if file_path.exists() == false {
+    if !file_path.exists() {
-
         let text = "This is the first line of the text.
         This is the second line.
         And this is the third and the last line.";
-        fs::write(&file_path, text).unwrap();
+        fs::write(file_path, text).unwrap();
         println!("File created.");
     }
-
 }