tp: Formatting print

formatted-print/Cargo.lock

@@ -0,0 +1,7 @@
+# This file is automatically @generated by Cargo.
+# It is not intended for manual editing.
+version = 4
+
+[[package]]
+name = "formatted-print"
+version = "0.1.0"

formatted-print/src/main.rs

@@ -1,3 +1,57 @@
 fn main() {
-    println!("Hello, world!");
+    // In general, the `{}` will be automatically replaced with any
+    // arguments. These will be stringified.
+    println!("{} days", 31);
+
+    // Positional arguments can be used. Specifying an integer inside `{}`
+    // determines which additional argument will be replaced. Arguments start
+    // at 0 immediately after the format string.
+    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");
+
+    // Different formatting can be invoked by specifying the format character
+    // after a `:`.
+    println!("Base 10:               {}",   69420); // 69420
+    println!("Base 2 (binary):       {:b}", 69420); // 10000111100101100
+    println!("Base 8 (octal):        {:o}", 69420); // 207454
+    println!("Base 16 (hexadecimal): {:x}", 69420); // 10f2c
+
+    // You can right-justify text with a specified width. This will
+    // output "    1". (Four white spaces and a "1", for a total width of 5.)
+    println!("{number:>5}", number=1);
+
+    // You can pad numbers with extra zeroes,
+    println!("{number:->5}", number=1); // 00001
+    // and left-adjust by flipping the sign. This will output "10000".
+    println!("{number:-<5}", number=1); // 10000
+
+    // You can use named arguments in the format specifier by appending a `$`.
+    println!("{number:->width$}", number=1, width=5);
+
+    // Rust even checks to make sure the correct number of arguments are used.
+    println!("My name is {0}, {1} {0}", "Bond", "James");
+    // FIXME ^ Add the missing argument: "James"
+
+    // Only types that implement fmt::Display can be formatted with `{}`. User-
+    // defined types do not implement fmt::Display by default.
+
+    #[allow(dead_code)] // disable `dead_code` which warn against unused module
+    struct Structure(i32);
+
+    // This will not compile because `Structure` does not implement
+    // fmt::Display.
+    // println!("This struct `{}` won't print...", Structure(3));
+    // TODO ^ Try uncommenting this line
+
+    // For Rust 1.58 and above, you can directly capture the argument from a
+    // surrounding variable. Just like the above, this will output
+    // "    1", 4 white spaces and a "1".
+    let number: f64 = 1.0;
+    let width: usize = 5;
+    println!("{number:>width$}");
 }