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f531d4dfd7
Part of #2478 to clean up code blocks when all that is needed is a trivial debug print statement. In certain slides (8.1, 9.2, 9.3, 10.5) I've opted to retain the use of println! because dbg! makes it less readable. The dbg! macro uses pretty-printing by default and this results in a simple array such as the one in 8.1 being printed vertically instead of a cleaner one-liner. Co-authored-by: Eric Githinji <egithinji@google.com>
62 lines
1.6 KiB
Rust
62 lines
1.6 KiB
Rust
// Copyright 2022 Google LLC
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//
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// Licensed under the Apache License, Version 2.0 (the "License");
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// you may not use this file except in compliance with the License.
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// You may obtain a copy of the License at
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//
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// http://www.apache.org/licenses/LICENSE-2.0
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//
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// Unless required by applicable law or agreed to in writing, software
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// distributed under the License is distributed on an "AS IS" BASIS,
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// WITHOUT WARRANTIES OR CONDITIONS OF ANY KIND, either express or implied.
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// See the License for the specific language governing permissions and
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// limitations under the License.
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// ANCHOR: solution
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// ANCHOR: transpose
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fn transpose(matrix: [[i32; 3]; 3]) -> [[i32; 3]; 3] {
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// ANCHOR_END: transpose
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let mut result = [[0; 3]; 3];
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for i in 0..3 {
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for j in 0..3 {
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result[j][i] = matrix[i][j];
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}
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}
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result
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}
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// ANCHOR: main
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fn main() {
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let matrix = [
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[101, 102, 103], // <-- the comment makes rustfmt add a newline
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[201, 202, 203],
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[301, 302, 303],
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];
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dbg!(matrix);
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let transposed = transpose(matrix);
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dbg!(transposed);
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}
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// ANCHOR_END: main
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// ANCHOR_END: solution
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// This test does not appear in the exercise, as this is very early in the course, but it verifies
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// that the solution is correct.
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#[test]
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fn test_transpose() {
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let matrix = [
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[101, 102, 103], //
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[201, 202, 203],
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[301, 302, 303],
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];
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let transposed = transpose(matrix);
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assert_eq!(
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transposed,
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[
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[101, 201, 301], //
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[102, 202, 302],
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[103, 203, 303],
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]
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);
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}
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