1st

Cargo.lock

@@ -0,0 +1,7 @@
+# This file is automatically @generated by Cargo.
+# It is not intended for manual editing.
+version = 3
+
+[[package]]
+name = "by-example-01-02-formatted-print"
+version = "0.1.0"

src/main.rs

@@ -1,3 +1,47 @@
 fn main() {
-    println!("Hello, world!");
+    // In general, the `{}` will be automatically replaced with any
+    // arguments. These will be stringified.
+    println!("{} days", 31);
+
+    // Without a suffix, 31 becomes an i32. You can change what type 31 is
+    // by providing a suffix. The number 31i64 for example has the type i64.
+
+    // There are various optional patterns this works with. Positional
+    // arguments can be used.
+    println!("{0}, this is {1}. {1}, this is {0}", "Alice", "Bob");
+
+    // As can named arguments.
+    println!(
+        "{subject} {verb} {object}",
+        object = "the lazy dog",
+        subject = "the quick brown fox",
+        verb = "jumps over",
+    );
+
+    // Special formatting can be specified after a `:`.
+    println!(
+        "{} of {:b} people know binary, the other half doesn't",
+        1, 2,
+    );
+
+    // You can right-align text with a specified width. This will output
+    // "     1". 5 white spaces and a "1".
+    println!("{number:>width$}", number = 1, width = 6);
+
+    // You can pad numbers with extra zeroes. This will output "000001".
+    println!("{number:>0width$}", number = 1, width = 6);
+
+    // Rust even checks to make sure the correct number of arguments are
+    // used.
+    //println!("My name is {0}, {1} {0}", "Bond");
+    // FIXME ^ Add the missing argument: "James"
+
+    // Create a structure named `Structure` which contains an `i32`.
+    #[allow(dead_code)]
+    struct Structure(i32);
+
+    // However, custom types such as this structure require more complicated
+    // handling. This will not work.
+    //println!("This struct `{}` won't print...", Structure(3));
+    // FIXME ^ Comment out this line.
 }