bare0_3

examples/bare0.rs

@@ -19,7 +19,7 @@ extern crate panic_halt;
 use cortex_m_rt::entry;
 
 // a constant (cannot be changed at run-time)
-const X_INIT: u32 = 10;
+const X_INIT: u32 = 0xffffffff;
 
 // global mutabale variables (changed using unsafe code)
 static mut X: u32 = X_INIT;
@@ -31,9 +31,9 @@ fn main() -> ! {
     let mut x = unsafe { X };
     
     loop {
-        x += 1; // <- place breakpoint here (3)
+        x.wrapping_add(1); // <- place breakpoint here (3)
         unsafe {
-            X += 1;
+            X.wrapping_add(1);
             Y = X;
             assert!(x == X && X == Y);
         }
@@ -75,10 +75,10 @@ fn main() -> ! {
 //
 //    Change (both) += opertions to use wrapping_add
 //    load and run the progam, what happens
-//    ** your answer here **
+//    ** x value stays at u32 max 4294967295**
 //
 //    Now continue exectution, what happens
-//    ** your answer here **
+//    ** X,Y and x  = 4294967295 **
 //
 //    Commit your answers (bare0_3)
 //