updates

class/ex1/Cargo.toml

@@ -0,0 +1,8 @@
+[package]
+name = "pretty_print"
+version = "0.1.0"
+edition = "2021"
+
+# See more keys and their definitions at https://doc.rust-lang.org/cargo/reference/manifest.html
+
+[dependencies]

class/ex1/src/main.rs

@@ -0,0 +1,45 @@
+// TODO: remove this when you're done with your implementation.
+#![allow(unused_variables, dead_code)]
+
+fn transpose(matrix: [[i32; 3]; 3]) -> [[i32; 3]; 3] {
+/*
+[[matrix[0][0],matrix[1][0],matrix[2][0]],
+[matrix[0][1],matrix[1][1],matrix[2][1]],
+[matrix[0][2],matrix[1][2],matrix[2][2]]]
+*/
+  let mut temp: [[i32; 3]; 3] = [0; 3]; 3]
+  for row in 0..3 { // has additional bounds checks
+// for row in matrix {
+//   println :
+// }
+    for col in 0..3 {
+      transposed[col][row] = matrix[row][col];
+     }
+  }
+  transposed
+}
+
+fn pretty_print(matrix: &[[i32; 3]; 3]) {
+    for x in 0..3 {
+      print!("[");
+      for y in 0..3 {
+		  print!("{} ", &matrix[x][y]);
+      }
+    print!("]\n");
+	}
+}
+
+fn main() {
+    let matrix = [
+        [101, 102, 103], // <-- the comment makes rustfmt add a newline
+        [201, 202, 203],
+        [301, 302, 303],
+    ];
+
+    println!("matrix:");
+    pretty_print(&matrix);
+
+    let transposed = transpose(matrix);
+    println!("transposed:");
+    pretty_print(&transposed);
+}

class/notes

@@ -158,3 +158,5 @@ traits!
 type conversions in a generic way
 x.into() will do the type conversion for you, if valid and lossless
 
+
+