我正在尝试在Rust中构建华氏度到摄氏度的转换器。
我编译成功,但是我不知道运行时出了什么问题。这是因为转换了吗?
这是我的代码:
use std::io;
fn main(){
println!("Please select\n 1.CELSIUS to FAHRENHEIT\n 2.FAHRENHEIT to CELSIUS");
const CEL_FAH: f64 = 32.00;
const FAH_CEL: f64 = -17.22;
let mut select = String::new();
io::stdin().read_line(&mut select)
.expect("Please select the appropriate options");
let select: i32 = select.parse().unwrap();
//control flow
if select == 1 {
println!("1. CELSIUS - FAHRENHEIT: ");
let cels = String::new();
let cels: f64 = cels.parse().unwrap();
let ans1 = cels * CEL_FAH;
println!("Conversions: {}", ans1);
} else if select == 2 {
println!("2. FAHRENHEIT - CELSIUS: ");
let fahs = String::new();
let fahs: f64 = fahs.parse().unwrap();
let ans2 = fahs * FAH_CEL;
println! ("Conversions: {}", ans2);
}else {
println!("Select the options please.");
}
}
这是我的输出和错误:
Compiling converter v0.1.0 (D:\Program Files\Rust Projects\converter)
Finished dev [unoptimized + debuginfo] target(s) in 2.46s
Running `target\debug\converter.exe`
Please select
1.CELSIUS to FAHRENHEIT
2.FAHRENHEIT to CELSIUS
2
thread 'main' panicked at 'called `Result::unwrap()` on an `Err` value: ParseIntError { kind: InvalidDigit }', src\main.rs:19:23
note: run with `RUST_BACKTRACE=1` environment variable to display a backtrace
error: process didn't exit successfully: `target\debug\converter.exe` (exit code: 101)```
最佳答案
在您的代码中,存在三个错误:
我已经在您的代码中进行了更正,现在可以正常工作了,以下是代码段:
use std::io;
fn main() {
println!("Please select\n 1.CELSIUS to FAHRENHEIT\n 2.FAHRENHEIT to CELSIUS");
const CEL_FAH: f64 = 32.00;
const FAH_CEL: f64 = 1.8; //changed
let mut select = String::new();
io::stdin()
.read_line(&mut select)
.expect("Please select the appropriate options");
let select: i32 = select.trim().parse().unwrap(); // .trim() method requires when taking input
//control flow
if select == 1 {
println!("1. CELSIUS - FAHRENHEIT: ");
let mut cels = String::new();
io::stdin()
.read_line(&mut cels)
.expect("Please input a temperature in degrees"); // when you're taking input from user you have to use stdin()
let cels: f64 = cels.trim().parse().unwrap();
let ans1 = (cels * FAH_CEL) + CEL_FAH; //this the correct formula to convert from celsius to fahrenheit
println!("Conversions: {}", ans1);
} else if select == 2 {
println!("2. FAHRENHEIT - CELSIUS: ");
let mut fahs = String::new();
io::stdin()
.read_line(&mut fahs)
.expect("Please input a temperature in degrees"); //when you're taking input from user you have to use stdin()
let fahs: f64 = fahs.trim().parse().unwrap();
let ans2 = (fahs - CEL_FAH) * 5. / 9.; //this the correct formula to convert from fahrenheit to celsius
println!("Conversions: {}", ans2);
} else {
println!("Select the options please.");
}
}
您也可以引用此存储库。 Temperature converter rust
关于rust - 如何解决 rust 中的 “value: ParseIntError”?,我们在Stack Overflow上找到一个类似的问题: https://stackoverflow.com/questions/61168269/