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Merge pull request #240 from Lmmmmmm-bb/chore/panic 

chore: solution of panic second question
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Sunface 2022-05-17 15:53:58 +08:00 committed by GitHub
parent ad2bace229 21688fafb5
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14
solutions/result-panic/panic.md
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@ -25,18 +25,20 @@ fn main() {
```rust ```rust
// MAKE the code work by fixing all panics // MAKE the code work by fixing all panics
fn main() { fn main() {
assert_eq!("abc".as_bytes(), [96, 97, 98]); assert_eq!("abc".as_bytes(), [97, 98, 99]);
let v = vec![1, 2, 3]; let v = vec![1, 2, 3];
let ele = v[3]; let ele = v[2];
// unwrap may panic when get return a None // unwrap may panic when get return a None
let ele = v.get(3).unwrap(); let ele = v.get(2).unwrap();
// Sometimes, the compiler is unable to find the overflow errors for you in compile time ,so a panic will occur // Sometimes, the compiler is unable to find the overflow errors for you in compile time ,so a panic will occur
let v = production_rate_per_hour(2); let v = production_rate_per_hour(2);
// because of the same reason as above, we have to wrap it in a function to make the panic occur // because of the same reason as above, we have to wrap it in a function to make the panic occur
divide(15, 0) divide(15, 1);
println!("Success!")
} }
fn divide(x:u8, y:u8) { fn divide(x:u8, y:u8) {
@ -44,7 +46,7 @@ fn divide(x:u8, y:u8) {
} }
fn production_rate_per_hour(speed: u8) -> f64 { fn production_rate_per_hour(speed: u8) -> f64 {
let cph: u8 = 221; let cph: u8 = 21;
match speed { match speed {
1..=4 => (speed * cph) as f64, 1..=4 => (speed * cph) as f64,
5..=8 => (speed * cph) as f64 * 0.9, 5..=8 => (speed * cph) as f64 * 0.9,
@ -56,4 +58,4 @@ fn production_rate_per_hour(speed: u8) -> f64 {
pub fn working_items_per_minute(speed: u8) -> u32 { pub fn working_items_per_minute(speed: u8) -> u32 {
(production_rate_per_hour(speed) / 60 as f64) as u32 (production_rate_per_hour(speed) / 60 as f64) as u32
} }
``` ```