priprava retazce

priprava_na_skusku2/src/main.rs

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+fn main() {
+    // 1. How to create it
+    let letter: char = 'a';     // Use SINGLE quotes for char
+    let emoji: char = '🦀';     // Even emojis are exactly ONE char
+    
+    // 2. Why it's useful
+    // You can ask it questions:
+    println!("{}", letter.is_alphabetic()); // Prints: true
+    println!("{}", letter.is_numeric());    // Prints: false
+    
+    // 3. Converting to a number (The "Address" of the letter)
+    // Every letter has a unique number in the world (Unicode).
+    let number = 'a' as u32; 
+    println!("{}", number); // Prints: 65
+    
+    // 4. Converting a number back to a letter
+    let back_to_char = std::char::from_u32(97); 
+    println!("{:?}", back_to_char); // Prints: Some('A')
+}