some more learning programms

looping.rs

@@ -0,0 +1,54 @@
+// loops
+// 
+
+
+// main function
+fn main() { 
+
+    // infinity loop
+    // loop {
+       // println!("neverending looping!");
+    // }
+    
+    let mut x = 5; // mut x: i32
+    let mut done = false; // mut done: bool
+    
+    while !done { // looping as long as done == true
+        x += x - 3; // adding 2 to x
+        println!("{}", x);
+        if x % 5 == 0 { // stop looping if x is multiple of 5
+            done = true;
+        }
+    }
+    
+    // redone of upper while loop -> better way
+    loop {
+        x += x - 3; // adding 2 to x
+        println!("{}", x);
+        if x % 5 == 0 { // stop looping if x is multiple of 5
+            break; // break out loop
+            // return; // will do the same as 'break'
+        }
+    }
+    
+    // for loop
+    'outer: for y in 0..10 {
+        'inner: for mut x in 0..10 { // from 0 to 9, 10 (upper bound is exclusive)
+            x += 1 + x;
+            if x % 2 == 0 { continue 'inner; } // go to next step inner loop -> only print odd numbers
+            if y % 2 == 0 { continue 'outer; } // go to next step outer loop
+            println!("now x is: {} and y is: {}", x, y); // x: i32
+        }
+    }
+
+    for (index, value) in (5..10).enumerate() {
+        println!("index = {} value = {}", index, value);
+    }
+    
+    let line = "Hello\nWorld!".lines();
+    
+    for (linenumber, line) in line.enumerate() {
+        println!("{}: {}", linenumber, line);
+    }
+}
+