068

exercises/068_comptime3.zig

@@ -20,71 +20,74 @@ const print = @import("std").debug.print;
 // This struct is the model of a model boat. We can transform it
 // to any scale we would like: 1:2 is half-size, 1:32 is
 // thirty-two times smaller than the real thing, and so forth.
-const Schooner = struct {
-    name: []const u8,
-    scale: u32 = 1,
-    hull_length: u32 = 143,
-    bowsprit_length: u32 = 34,
-    mainmast_height: u32 = 95,
-
-    fn scaleMe(self: *Schooner, comptime scale: u32) void {
-        comptime var my_scale = scale;
-
-        // We did something neat here: we've anticipated the
-        // possibility of accidentally attempting to create a
-        // scale of 1:0. Rather than having this result in a
-        // divide-by-zero error at runtime, we've turned this
-        // into a compile error.
-        //
-        // This is probably the correct solution most of the
-        // time. But our model boat model program is very casual
-        // and we just want it to "do what I mean" and keep
-        // working.
-        //
-        // Please change this so that it sets a 0 scale to 1
-        // instead.
-        if (my_scale == 0) @compileError("Scale 1:0 is not valid!");
-
-        self.scale = my_scale;
-        self.hull_length /= my_scale;
-        self.bowsprit_length /= my_scale;
-        self.mainmast_height /= my_scale;
-    }
-
-    fn printMe(self: Schooner) void {
-        print("{s} (1:{}, {} x {})\n", .{
-            self.name,
-            self.scale,
-            self.hull_length,
-            self.mainmast_height,
-        });
+const Schooner = struct{
+  name: []const u8,
+  scale: u32 = 1,
+  hull_length: u32 = 143,
+  bowsprit_length: u32 = 34,
+  mainmast_height: u32 = 95,
+  
+  fn scaleMe(self: *Schooner, comptime scale: u32) void{
+    comptime var my_scale = scale;
+    
+    // We did something neat here: we've anticipated the
+    // possibility of accidentally attempting to create a
+    // scale of 1:0. Rather than having this result in a
+    // divide-by-zero error at runtime, we've turned this
+    // into a compile error.
+    //
+    // This is probably the correct solution most of the
+    // time. But our model boat model program is very casual
+    // and we just want it to "do what I mean" and keep
+    // working.
+    //
+    // Please change this so that it sets a 0 scale to 1
+    // instead.
+    if(my_scale == 0){
+      //@compileError("Scale 1:0 is not valid!");
+      my_scale = 1;
     }
+    
+    self.scale = my_scale;
+    self.hull_length /= my_scale;
+    self.bowsprit_length /= my_scale;
+    self.mainmast_height /= my_scale;
+  }
+  
+  fn printMe(self: Schooner) void{
+    print("{s} (1:{}, {} x {})\n", .{
+      self.name,
+      self.scale,
+      self.hull_length,
+      self.mainmast_height,
+    });
+  }
 };
 
-pub fn main() void {
-    var whale = Schooner{ .name = "Whale" };
-    var shark = Schooner{ .name = "Shark" };
-    var minnow = Schooner{ .name = "Minnow" };
-
-    // Hey, we can't just pass this runtime variable as an
-    // argument to the scaleMe() method. What would let us do
-    // that?
-    var scale: u32 = undefined;
-
-    scale = 32; // 1:32 scale
-
-    minnow.scaleMe(scale);
-    minnow.printMe();
-
-    scale -= 16; // 1:16 scale
-
-    shark.scaleMe(scale);
-    shark.printMe();
-
-    scale -= 16; // 1:0 scale (oops, but DON'T FIX THIS!)
-
-    whale.scaleMe(scale);
-    whale.printMe();
+pub fn main() void{
+  var whale = Schooner{ .name = "Whale" };
+  var shark = Schooner{ .name = "Shark" };
+  var minnow = Schooner{ .name = "Minnow" };
+  
+  // Hey, we can't just pass this runtime variable as an
+  // argument to the scaleMe() method. What would let us do
+  // that?
+  comptime var scale: u32 = undefined;
+  
+  scale = 32; // 1:32 scale
+  
+  minnow.scaleMe(scale);
+  minnow.printMe();
+  
+  scale -= 16; // 1:16 scale
+  
+  shark.scaleMe(scale);
+  shark.printMe();
+  
+  scale -= 16; // 1:0 scale (oops, but DON'T FIX THIS!) // 1:1 fixed now
+  
+  whale.scaleMe(scale);
+  whale.printMe();
 }
 //
 // Going deeper:
@@ -106,3 +109,4 @@ pub fn main() void {
 //       planet.
 //
 // Answers can be found on the back of the Ziglings packaging.
+