June 2018 Update

Task/Identity-matrix/Rust/identity-matrix.rust

@@ -0,0 +1,41 @@
+extern crate num;
+struct Matrix<T> {
+    data: Vec<T>,
+    size: usize,
+}
+
+impl<T> Matrix<T>
+where
+    T: num::Num + Clone + Copy,
+{
+    fn new(size: usize) -> Self {
+        Self {
+            data: vec![T::zero(); size * size],
+            size: size,
+        }
+    }
+    fn get(&mut self, x: usize, y: usize) -> T {
+        self.data[x + self.size * y]
+    }
+    fn identity(&mut self) {
+        for (i, item) in self.data.iter_mut().enumerate() {
+            *item = if i % (self.size + 1) == 0 {
+                T::one()
+            } else {
+                T::zero()
+            }
+        }
+    }
+}
+
+fn main() {
+    let size = std::env::args().nth(1).unwrap().parse().unwrap();
+    let mut matrix = Matrix::<i32>::new(size);
+    matrix.identity();
+    for y in 0..size {
+        for x in 0..size {
+            print!("{} ", matrix.get(x, y));
+        }
+        println!();
+    }
+}