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Pass slices to functions in exercise 9.6.1 (#2848) #2850

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Pass slices to functions in exercise 9.6.1 (#2848) #2850

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10 changes: 8 additions & 2 deletions src/references/exercise.rs
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Original file line number Diff line number Diff line change
Expand Up @@ -14,7 +14,7 @@

// ANCHOR: solution
/// Calculate the magnitude of the given vector.
fn magnitude(vector: &[f64; 3]) -> f64 {
fn magnitude(vector: &[f64]) -> f64 {
let mut mag_squared = 0.0;
for coord in vector {
mag_squared += coord * coord;
Expand All @@ -23,7 +23,7 @@ fn magnitude(vector: &[f64; 3]) -> f64 {
}

/// Change the magnitude of the vector to 1.0 without changing its direction.
fn normalize(vector: &mut [f64; 3]) {
fn normalize(vector: &mut [f64]) {
let mag = magnitude(vector);
for item in vector {
*item /= mag;
Expand All @@ -38,5 +38,11 @@ fn main() {
println!("Magnitude of {v:?}: {}", magnitude(&v));
normalize(&mut v);
println!("Magnitude of {v:?} after normalization: {}", magnitude(&v));

// Normalize a 4d-vector
let mut v4 = [1.0, 2.0, 3.0, 4.0];
println!("4d-vector: {v4:?}");
normalize(&mut v4);
println!("Normalized 4d-vector: {v4:?}");
}
// ANCHOR_END: main
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