updated license information

.idea/.gitignore

@@ -0,0 +1,8 @@
+# Default ignored files
+/shelf/
+/workspace.xml
+# Editor-based HTTP Client requests
+/httpRequests/
+# Datasource local storage ignored files
+/dataSources/
+/dataSources.local.xml

.idea/Rust-Programming.iml

@@ -0,0 +1,12 @@
+<?xml version="1.0" encoding="UTF-8"?>
+<module type="JAVA_MODULE" version="4">
+  <component name="NewModuleRootManager" inherit-compiler-output="true">
+    <exclude-output />
+    <content url="file://$MODULE_DIR$">
+      <sourceFolder url="file://$MODULE_DIR$/duplicates/src" isTestSource="false" />
+      <excludeFolder url="file://$MODULE_DIR$/duplicates/target" />
+    </content>
+    <orderEntry type="inheritedJdk" />
+    <orderEntry type="sourceFolder" forTests="false" />
+  </component>
+</module>

.idea/misc.xml

@@ -0,0 +1,6 @@
+<?xml version="1.0" encoding="UTF-8"?>
+<project version="4">
+  <component name="ProjectRootManager">
+    <output url="file://$PROJECT_DIR$/out" />
+  </component>
+</project>

.idea/modules.xml

@@ -0,0 +1,8 @@
+<?xml version="1.0" encoding="UTF-8"?>
+<project version="4">
+  <component name="ProjectModuleManager">
+    <modules>
+      <module fileurl="file://$PROJECT_DIR$/.idea/Rust-Programming.iml" filepath="$PROJECT_DIR$/.idea/Rust-Programming.iml" />
+    </modules>
+  </component>
+</project>

.idea/vcs.xml

@@ -0,0 +1,6 @@
+<?xml version="1.0" encoding="UTF-8"?>
+<project version="4">
+  <component name="VcsDirectoryMappings">
+    <mapping directory="" vcs="Git" />
+  </component>
+</project>

duplicates/src/main.rs

@@ -1,19 +1,123 @@
+/**
+ *                _ _   _               _
+ * __      ___ __(_) |_| |_ ___ _ __   | |__  _   _
+ * \ \ /\ / / '__| | __| __/ _ \ '_ \  | '_ \| | | |
+ *  \ V  V /| |  | | |_| ||  __/ | | | | |_) | |_| |
+ *   \_/\_/ |_|  |_|\__|\__\___|_| |_| |_.__/ \__, |
+ *                                            |___/
+ *  ____                  __     __               _
+ * / ___|_   _____ _ __   \ \   / /__   __ _  ___| |
+ * \___ \ \ / / _ \ '_ \   \ \ / / _ \ / _` |/ _ \ |
+ *  ___) \ V /  __/ | | |   \ V / (_) | (_| |  __/ |
+ * |____/ \_/ \___|_| |_|    \_/ \___/ \__, |\___|_|
+ *                                     |___/
+ * Licensed under the GPLv2 License, Version 2.0 (the "License");
+ * Copyright (c) Sven Vogel
+ */
+
+use crate::FloatOrChar::{Char, Float};
+use std::collections::{HashMap, HashSet};
+use std::fmt::Debug;
+use std::usize;
+
+/// pretty useless enum that either contains a char or
+/// a f32
+#[derive(Debug)]
+enum FloatOrChar {
+    Float(f64),
+    Char(char),
+}
+
+impl PartialEq for FloatOrChar {
+    /// only returns true if
+    /// self and other of the same enum variant and their wrapped values match
+    fn eq(&self, other: &Self) -> bool {
+        return match self {
+            Float(x) => {
+                if let Float(y) = *other {
+                    // compare floats with tolerance
+                    (*x - y).abs() < f64::EPSILON
+                } else {
+                    false // other is not a Float32
+                }
+            }
+            Char(x) => {
+                if let Char(y) = *other {
+                    *x == y
+                } else {
+                    false // other is not a Char
+                }
+            }
+        };
+    }
+
+    /// opposite of equals
+    fn ne(&self, other: &Self) -> bool {
+        !self.eq(other)
+    }
+}
+
+/// count all duplicate values in an array
+/// equivalence is determined by the [`PartialEq`] trait
+fn duplicates<T>(arr: &[T]) -> usize
+where
+    T: PartialEq + Debug,
+{
+    let mut total_dups = 0;
 
-fn duplicates<T>(arr: &[T]) -> usize where T: PartialEq {
-    let mut dups = 0;
     for x in 0..arr.len() {
         let to_cmp = &arr[x];
-        for y in (x+1)..arr.len() {
+        let mut count = 0;
+
+        for y in (x + 1)..arr.len() {
             if &arr[y] == to_cmp {
-                dups += 1;
+                count += 1;
             }
         }
+
+        total_dups += count;
+
+        if count > 0 {
+            println!("Element {:?} was duplicated {} time(s)", to_cmp, count);
+        }
     }
-    dups * 2
+
+    total_dups
+}
+
+/// read some data from stdin and stores it into a vector.
+/// the reading of data stops if the input is neither a float nor a single character.
+/// input line are trimmed
+fn read_array() -> Vec<FloatOrChar> {
+    // temporary string buffer for reading
+    let mut buf = String::new();
+    // storage for our parsed array
+    let mut elems = Vec::<FloatOrChar>::new();
+
+    println!("Enter some floats or characters, one per line:");
+
+    loop {
+        // read some characters
+        std::io::stdin().read_line(&mut buf).unwrap();
+
+        // parse the data
+        if let Ok(float) = buf.trim().parse::<f64>() {
+            elems.push(Float(float));
+        } else if let Ok(char) = buf.trim().parse::<char>() {
+            elems.push(Char(char));
+        } else {
+            break;
+        }
+
+        // empty string
+        buf.clear();
+    }
+
+    elems
 }
 
 fn main() {
-    let arr = ['😇', '🙈', '💀', '💦', '💣', '💀'];
+    let arr = &read_array()[..];
 
     println!("Duplicates: {}", duplicates(&arr));
 }

fibonacci/src/main.rs

@@ -1,4 +1,21 @@
+/**
+ *                _ _   _               _
+ * __      ___ __(_) |_| |_ ___ _ __   | |__  _   _
+ * \ \ /\ / / '__| | __| __/ _ \ '_ \  | '_ \| | | |
+ *  \ V  V /| |  | | |_| ||  __/ | | | | |_) | |_| |
+ *   \_/\_/ |_|  |_|\__|\__\___|_| |_| |_.__/ \__, |
+ *                                            |___/
+ *  ____                  __     __               _
+ * / ___|_   _____ _ __   \ \   / /__   __ _  ___| |
+ * \___ \ \ / / _ \ '_ \   \ \ / / _ \ / _` |/ _ \ |
+ *  ___) \ V /  __/ | | |   \ V / (_) | (_| |  __/ |
+ * |____/ \_/ \___|_| |_|    \_/ \___/ \__, |\___|_|
+ *                                     |___/
+ * Licensed under the GPLv2 License, Version 2.0 (the "License");
+ * Copyright (c) Sven Vogel
+ */
 
+/// recursive variant of the fibonacci function
 fn fib_rec(x: u128) -> u128 {
     if x < 2 {
         return x;
@@ -7,11 +24,12 @@ fn fib_rec(x: u128) -> u128 {
     return fib_rec(x - 1) + fib_rec(x - 2);
 }
 
+/// iterative variant of the fibonacci function
 fn fib_loop(x: u128) -> u128 {
     let mut sum = 0;
     let mut sum2 = 1;
 
-    for x in 0..(x-1) {
+    for x in 0..(x - 1) {
         let t = sum;
         sum = sum2;
         sum2 = t + sum;
@@ -20,6 +38,5 @@ fn fib_loop(x: u128) -> u128 {
 }
 
 fn main() {
-
     println!("{}", fib_loop(5));
 }

tuple_arithmetic/src/main.rs

@@ -1,4 +1,20 @@
-/* Compressed version:
+/**
+ *                _ _   _               _
+ * __      ___ __(_) |_| |_ ___ _ __   | |__  _   _
+ * \ \ /\ / / '__| | __| __/ _ \ '_ \  | '_ \| | | |
+ *  \ V  V /| |  | | |_| ||  __/ | | | | |_) | |_| |
+ *   \_/\_/ |_|  |_|\__|\__\___|_| |_| |_.__/ \__, |
+ *                                            |___/
+ *  ____                  __     __               _
+ * / ___|_   _____ _ __   \ \   / /__   __ _  ___| |
+ * \___ \ \ / / _ \ '_ \   \ \ / / _ \ / _` |/ _ \ |
+ *  ___) \ V /  __/ | | |   \ V / (_) | (_| |  __/ |
+ * |____/ \_/ \___|_| |_|    \_/ \___/ \__, |\___|_|
+ *                                     |___/
+ * Licensed under the GPLv2 License, Version 2.0 (the "License");
+ * Copyright (c) Sven Vogel
+ *
+ * Compressed version:
  *
  *  type V=(f64,f64);fn t(a:V,b:V,f:fn(
  *  a:f64,b:f64)->f64)->V{(f(a.0,b.0),f
@@ -6,15 +22,10 @@
  *  t(t((2.42,2.07),(0.3,3.2),|a,b|{a/b
  *  }),t((1.7,2.3),(0.73,0.42),|a,b|{a*
  *  b}),|a,b|{a-b}))}
- *
  */
 
-
+fn merge_tuple(a: (f64, f64), b: (f64, f64), f: fn(a: f64, b: f64) -> f64) -> (f64, f64) {
-fn merge_tuple(a: (f64, f64), b: (f64, f64), f: fn (a: f64, b: f64) -> f64) -> (f64, f64) {
+    (f(a.0, b.0), f(a.1, b.1))
-    (
-        f(a.0, b.0),
-        f(a.1, b.1),
-    )
 }
 
 fn add_tuple(a: (f64, f64), b: (f64, f64)) -> (f64, f64) {
@@ -34,5 +45,11 @@ fn div_tuple(a: (f64, f64), b: (f64, f64)) -> (f64, f64) {
 }
 
 fn main() {
-    println!("{:#?}", sub_tuple(div_tuple((2.42, 2.07), (0.3, 3.2)), mul_tuple((1.7, 2.3), (0.73, 0.42))));
+    println!(
+        "{:#?}",
+        sub_tuple(
+            div_tuple((2.42, 2.07), (0.3, 3.2)),
+            mul_tuple((1.7, 2.3), (0.73, 0.42))
+        )
+    );
 }