add a "solutions" crate with a BigInt class

[rust-101.git] / src / part01.rs

diff --git a/src/part01.rs b/src/part01.rs
index 36e15d0245941e07de68de0332ec12b823b5ae37..1603c14eec792e7fa99cde49e6ae2d504dcdba5d 100644 (file)
--- a/src/part01.rs
+++ b/src/part01.rs
@@ -1,4 +1,4 @@
-// Rust-101, Part 00: Expressions, Inherent methods
+// Rust-101, Part 01: Expressions, Inherent methods
 // ================================================
 
 use std;
@@ -34,18 +34,13 @@ fn number_or_default(n: NumberOrNothing, default: i32) -> i32 {
     }
 }
 
-// With this fresh knowledge, let us now refactor `vec_min`. First of all, we are doing a small change
-// to the type: `&Vec<i32>` denotes a *reference* to a `Vec<i32>`. You can think of this as a pointer
-// (in C terms): Arguments in Rust are passed *by value*, so we need to employ explicit references if
-// that's not what we want. References are per default immutable (like variables), a mutable reference
-// would be denoted `&mut Vec<i32>`.
-fn vec_min(v: &Vec<i32>) -> NumberOrNothing {
+// With this fresh knowledge, let us now refactor `vec_min`.
+fn vec_min(v: Vec<i32>) -> NumberOrNothing {
     let mut min = Nothing;
     for e in v {
-        let e = *e;
         // Notice that all we do here is compute a new value for `min`, and that it will always end
         // up being a `Number` rather than `Nothing`. In Rust, the structure of the code
-        // can express this uniformity as follows:
+        // can express this uniformity.
         min = Number(match min {
             Nothing => e,
             Number(n) => std::cmp::min(n, e)
@@ -63,7 +58,7 @@ fn vec_min(v: &Vec<i32>) -> NumberOrNothing {
 // So much for `vec_min`. Let us now reconsider `print_number_or_nothing`. That function
 // really belongs pretty close to the type `NumberOrNothing`. In C++ or Java, you would
 // probably make it a method of the type. In Rust, we can achieve something very similar
-// by providing an *inherent implementation* as follows:
+// by providing an *inherent implementation*.
 impl NumberOrNothing {
     fn print(self) {
         match self {
@@ -77,19 +72,23 @@ impl NumberOrNothing {
 // is independent of the definition of the type. `self` is like `this` in other
 // languages, and its type is always implicit. So `print` is now a method that
 // takes as first argument a `NumberOrNothing`, just like `print_number_or_nothing`.
-//
+// 
 // Try making `number_or_default` from above an inherent method as well!
 
 // With our refactored functions and methods, `main` now looks as follows:
 fn read_vec() -> Vec<i32> {
     vec![18,5,7,2,9,27]
 }
-pub fn part_main() {
+pub fn main() {
     let vec = read_vec();
-    let min = vec_min(&vec);
+    let min = vec_min(vec);
     min.print();
 }
 // You will have to replace `part00` by `part01` in the `main` function in
 // `main.rs` to run this code.
 
+// **Exercise**: Write a funtion `vec_avg` that computes the average value of a `Vec<i32>`.
+// 
+// *Hint*: `vec.len()` returns the length of a vector `vec`.
+
 // [index](main.html) | [previous](part00.html) | [next](part02.html)