add match and match expressions

control_flow/src/main.rs

@@ -1,23 +1,45 @@
 fn main() {
-
     //if else statements
     let mut num1 = 10;
     let mut num2 = 5;
 
     if num1 < num2 {
-        println!("{} is smaller then {}",num1, num2);
-    }
-    else
-    {
-        println!("{} is bigger then {}",num1,num2);
+        println!("{} is smaller then {}", num1, num2);
+    } else {
+        println!("{} is bigger then {}", num1, num2);
     }
 
     //if expressions
     //always need a else case and must be of the same type, ternary operations do not exist but this results the same
-    num1 = if num1 != num2 {5} else {15};
-    println!("num 1: {}",num1)
+    num1 = if num1 != num2 { 5 } else { 15 };
+    println!("num 1: {}", num1);
 
+    //match
+    //same as switch case
+    match num1 {
+        1 => println!("Number is 1"),
+        2 => println!("Number is 2"),
+        3 => println!("Number is 3"),
+        6 => println!("Number is 6"),
+        7 => println!("Number is 7"),
+        _ => println!("Number is none of the other statements"),
+    }
+    // _ is a default and altough syntax specifies => it should be an exact match
 
+    //combining match results
+    match num2 {
+        1 | 2 | 3 | 4 => println!("Number is in range of 1 to 4"),
+        5 | 7 => println!("Number is 5 or 7"),
+        _ => println!("Number is none of the above"),
+    }
 
+    //match expression
+    println!("Old number for num2: {}",num2);
+    let num2 = match num2 {
+         1 | 2 | 3 | 4 => 1234,
+        5 | 7 => 57,
+        _ => -1,
+    };
+    println!("New number for num2: {}",num2);
 
 }