I tried to make a temperature converter from Fahrenheit units to Celsius units on Rust

Question

I tried to make a temperature converter from Fahrenheit units to Celsius units on Rust

use std::io;

fn main() {
    let mut celsius = String::new();
    io::stdin()
        .read_line(&mut celsius)
        .expect("Falied to read line");
    let farenheit = (celsius * 9 / 5) + 32;
}

Returns the error: cannot multiply {integer} to std::string::String

1

rust

Author: saintech, 2020-11-11

Source

1 answers

score 0 · Answer 1

Full modified code below, using the functions str::parse::<T>() (documentation) and str::trim() (documentation):

Try it online!

use std::io;

fn main() {
    let mut celsius = String::new();
    io::stdin()
        .read_line(&mut celsius)
        .expect("Falied to read line");
    let ncelsius = celsius.trim().parse::<i32>().expect("Failed parsing int");
    let farenheit = (ncelsius * 9 / 5) + 32;
    println!("{}", farenheit);
}

Entrance:

Exit: