Rust program to read a float number from the user

Here, we are going to learn how to read a float number from the user in Rust programming language?
Submitted by Nidhi, on September 22, 2021

Problem Solution:

Here, we will read a floating-point number from the user and print the input value.

Program/Source Code:

The source code to read an integer number from the user is given below. The given program is compiled and executed successfully.

// Rust program to read a float number 
// from the user

use std::io;

fn main() {
    let mut num:f32=0.0;
    let mut input = String::new();
    println!("Enter number: ");
    io::stdin().read_line(&mut input).expect("Not a valid string");
    num = input.trim().parse().expect("Not a valid number");
    println!("Number is: {}",num);


RUN 1:
Enter number: 
Number is: 123.45

RUN 2:
Enter number: 
thread 'main' panicked at 
'Not a valid number: ParseFloatError { kind: Invalid }', 
note: run with `RUST_BACKTRACE=1` environment variable 
to display a backtrace.


Here, we created a 32-bit floating-point variable num and then read the value for num from the user using the read_line() function and printed the result.

Rust Basic Programs »

Related Programs

Comments and Discussions!

Load comments ↻

Copyright © 2024 All rights reserved.