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src/control-flow/while-expressions.md

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+# `while` expressions
+
+The `while` keyword works very similar to other languages:
+
+```rust,editable
+fn main() {
+    let mut x = 10;
+    while x != 1 {
+        x = if x % 2 == 0 {
+            x / 2
+        } else {
+            3 * x + 1
+        };
+    }
+    println!("Final x: {x}");
+}
+```
+