Merge hi-rust

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-          <p>아주대학교 Software Tool Time - Rust 튜토리얼 (Basic)</p>
+          <p><a target="_blank" rel="noopener" href="https://www.youtube.com/c/SoftwareToolTime">아주대학교 Software Tool Time</a> - Rust 튜토리얼 (Basic)</p>
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         <footer>
-          <p>아주대학교 Software Tool Time - Rust 튜토리얼 (Basic)</p>
+          <p><a target="_blank" rel="noopener" href="https://www.youtube.com/c/SoftwareToolTime">아주대학교 Software Tool Time</a> - Rust 튜토리얼 (Basic)</p>
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docs/03_ko.html

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         </script>
 
         <footer>
-          <p>아주대학교 Software Tool Time - Rust 튜토리얼 (Basic)</p>
+          <p><a target="_blank" rel="noopener" href="https://www.youtube.com/c/SoftwareToolTime">아주대학교 Software Tool Time</a> - Rust 튜토리얼 (Basic)</p>
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         </script>
 
         <footer>
-          <p>아주대학교 Software Tool Time - Rust 튜토리얼 (Basic)</p>
+          <p><a target="_blank" rel="noopener" href="https://www.youtube.com/c/SoftwareToolTime">아주대학교 Software Tool Time</a> - Rust 튜토리얼 (Basic)</p>
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docs/05_ko.html

@@ -71,7 +71,7 @@ $ Hello, world! (stdout)
         </script>
 
         <footer>
-          <p>아주대학교 Software Tool Time - Rust 튜토리얼 (Basic)</p>
+          <p><a target="_blank" rel="noopener" href="https://www.youtube.com/c/SoftwareToolTime">아주대학교 Software Tool Time</a> - Rust 튜토리얼 (Basic)</p>
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docs/07_ko.html

@@ -78,7 +78,7 @@ fn main() {
         </script>
 
         <footer>
-          <p>아주대학교 Software Tool Time - Rust 튜토리얼 (Basic)</p>
+          <p><a target="_blank" rel="noopener" href="https://www.youtube.com/c/SoftwareToolTime">아주대학교 Software Tool Time</a> - Rust 튜토리얼 (Basic)</p>
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docs/08_ko.html

@@ -69,7 +69,7 @@
         </script>
 
         <footer>
-          <p>아주대학교 Software Tool Time - Rust 튜토리얼 (Basic)</p>
+          <p><a target="_blank" rel="noopener" href="https://www.youtube.com/c/SoftwareToolTime">아주대학교 Software Tool Time</a> - Rust 튜토리얼 (Basic)</p>
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docs/09_ko.html

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         </script>
 
         <footer>
-          <p>아주대학교 Software Tool Time - Rust 튜토리얼 (Basic)</p>
+          <p><a target="_blank" rel="noopener" href="https://www.youtube.com/c/SoftwareToolTime">아주대학교 Software Tool Time</a> - Rust 튜토리얼 (Basic)</p>
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docs/10_ko.html

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         </script>
 
         <footer>
-          <p>아주대학교 Software Tool Time - Rust 튜토리얼 (Basic)</p>
+          <p><a target="_blank" rel="noopener" href="https://www.youtube.com/c/SoftwareToolTime">아주대학교 Software Tool Time</a> - Rust 튜토리얼 (Basic)</p>
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@@ -102,7 +102,7 @@ let my_number_string = my_number.to_string(); // "42"라는 String 타입으로
         </script>
 
         <footer>
-          <p>아주대학교 Software Tool Time - Rust 튜토리얼 (Basic)</p>
+          <p><a target="_blank" rel="noopener" href="https://www.youtube.com/c/SoftwareToolTime">아주대학교 Software Tool Time</a> - Rust 튜토리얼 (Basic)</p>
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docs/12_ko.html

@@ -64,7 +64,7 @@
         </script>
 
         <footer>
-          <p>아주대학교 Software Tool Time - Rust 튜토리얼 (Basic)</p>
+          <p><a target="_blank" rel="noopener" href="https://www.youtube.com/c/SoftwareToolTime">아주대학교 Software Tool Time</a> - Rust 튜토리얼 (Basic)</p>
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docs/13_ko.html

@@ -64,7 +64,7 @@
         </script>
 
         <footer>
-          <p>아주대학교 Software Tool Time - Rust 튜토리얼 (Basic)</p>
+          <p><a target="_blank" rel="noopener" href="https://www.youtube.com/c/SoftwareToolTime">아주대학교 Software Tool Time</a> - Rust 튜토리얼 (Basic)</p>
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docs/14_ko.html

@@ -66,7 +66,7 @@
         </script>
 
         <footer>
-          <p>아주대학교 Software Tool Time - Rust 튜토리얼 (Basic)</p>
+          <p><a target="_blank" rel="noopener" href="https://www.youtube.com/c/SoftwareToolTime">아주대학교 Software Tool Time</a> - Rust 튜토리얼 (Basic)</p>
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docs/15_ko.html

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         </script>
 
         <footer>
-          <p>아주대학교 Software Tool Time - Rust 튜토리얼 (Basic)</p>
+          <p><a target="_blank" rel="noopener" href="https://www.youtube.com/c/SoftwareToolTime">아주대학교 Software Tool Time</a> - Rust 튜토리얼 (Basic)</p>
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docs/16_ko.html

@@ -64,7 +64,7 @@
         </script>
 
         <footer>
-          <p>아주대학교 Software Tool Time - Rust 튜토리얼 (Basic)</p>
+          <p><a target="_blank" rel="noopener" href="https://www.youtube.com/c/SoftwareToolTime">아주대학교 Software Tool Time</a> - Rust 튜토리얼 (Basic)</p>
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docs/17_ko.html

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         </script>
 
         <footer>
-          <p>아주대학교 Software Tool Time - Rust 튜토리얼 (Basic)</p>
+          <p><a target="_blank" rel="noopener" href="https://www.youtube.com/c/SoftwareToolTime">아주대학교 Software Tool Time</a> - Rust 튜토리얼 (Basic)</p>
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docs/18_ko.html

@@ -168,7 +168,7 @@ fn main() {
         </script>
 
         <footer>
-          <p>아주대학교 Software Tool Time - Rust 튜토리얼 (Basic)</p>
+          <p><a target="_blank" rel="noopener" href="https://www.youtube.com/c/SoftwareToolTime">아주대학교 Software Tool Time</a> - Rust 튜토리얼 (Basic)</p>
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docs/19_ko.html

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         </script>
 
         <footer>
-          <p>아주대학교 Software Tool Time - Rust 튜토리얼 (Basic)</p>
+          <p><a target="_blank" rel="noopener" href="https://www.youtube.com/c/SoftwareToolTime">아주대학교 Software Tool Time</a> - Rust 튜토리얼 (Basic)</p>
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docs/20_ko.html

@@ -94,7 +94,7 @@ Rust에서는 결과를 나타내기 위해 Result 열거형을 사용합니다.
         </script>
 
         <footer>
-          <p>아주대학교 Software Tool Time - Rust 튜토리얼 (Basic)</p>
+          <p><a target="_blank" rel="noopener" href="https://www.youtube.com/c/SoftwareToolTime">아주대학교 Software Tool Time</a> - Rust 튜토리얼 (Basic)</p>
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docs/21_ko.html

@@ -45,6 +45,91 @@
 <li><a href="https://doc.rust-lang.org/1.30.0/book/2018-edition/ch03-02-data-types.html" target="_blank" rel="noopener">Website: Rust Book 2018 - 기본 데이터 유형에 대한 자세한 설명</a></li>
 <li><a href="https://cheats.rs/#basic-types" target="_blank" rel="noopener">Website: Rust Cheat Sheet - Data Types</a></li>
 </ul>
+<div> <button type="button" class="collapsible">정답 보기</button> <div class="content"> <pre><code class="rust">enum Shape {
+    Circle(f64),             // 반지름
+    Rectangle(f64, f64),     // 가로, 세로
+    Triangle(f64, f64, f64), // 세 변의 길이
+}
+
+// 넓이를 계산하는 함수
+fn area(shape: &Shape) -> f64 {
+    match shape {
+        Shape::Circle(r) => 3.14 * r * r,
+        Shape::Rectangle(w, h) => w * h,
+        Shape::Triangle(a, b, c) => {
+            // 삼각형의 넓이 공식
+            let s = (a + b + c) / 2.0;
+            let area = s * (s - a) * (s - b) * (s - c);
+            // 넓이가 음수면 에러 발생
+            if area < 0.0 {
+                panic!("Invalid triangle");
+            } else {
+                area.sqrt()
+            }
+        }
+    }
+}
+
+// 둘레를 계산하는 함수
+fn perimeter(shape: &Shape) -> f64 {
+    match shape {
+        Shape::Circle(r) => 2.0 * 3.14 * r,
+        Shape::Rectangle(w, h) => 2.0 * (w + h),
+        Shape::Triangle(a, b, c) => {
+            // 삼각형의 둘레 공식
+            let p = a + b + c;
+            // 둘레가 음수면 에러 발생
+            if p < 0.0 {
+                panic!("Invalid triangle");
+            } else {
+                p
+            }
+        }
+    }
+}
+
+// 정사각형인지 판별하는 함수
+fn is_square(shape: &Shape) -> bool {
+    match shape {
+        Shape::Circle(_) => false,
+        Shape::Rectangle(w, h) => w == h,
+        Shape::Triangle(_, _, _) => false,
+    }
+}
+
+// 결과
+/*
+원 넓이: 12.56
+사각형 넓이: 12
+삼각형 넓이: 6
+원 둘레: 12.56
+사각형 둘레: 14
+삼각형 둘레: 12
+원이 정사각형인가? false
+사각형이 정사각형인가? false
+삼각형이 정사각형인가? false
+*/
+fn main() {
+    // Shape 타입의 값들을 생성합니다.
+    let circle = Shape::Circle(2.0);
+    let rectangle = Shape::Rectangle(3.0, 4.0);
+    let triangle = Shape::Triangle(3.0, 4.0, 5.0);
+
+    // 각 도형의 넓이를 출력합니다.
+    println!("원 넓이: {}", area(&circle));
+    println!("사각형 넓이: {}", area(&rectangle));
+    println!("삼각형 넓이: {}", area(&triangle));
+
+    // 각 도형의 둘레를 출력합니다.
+    println!("원 둘레: {}", perimeter(&circle));
+    println!("사각형 둘레: {}", perimeter(&rectangle));
+    println!("삼각형 둘레: {}", perimeter(&triangle));
+
+    // 각 도형이 정사각형인지 출력합니다.
+    println!("원이 정사각형인가? {}", is_square(&circle));
+    println!("사각형이 정사각형인가? {}", is_square(&rectangle));
+    println!("삼각형이 정사각형인가? {}", is_square(&triangle));
+}</code></pre> </div> </div>
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+          <p><a target="_blank" rel="noopener" href="https://www.youtube.com/c/SoftwareToolTime">아주대학교 Software Tool Time</a> - Rust 튜토리얼 (Basic)</p>
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