CODEWITHSUNDEEP
inputprintingrust
Sriram
Sriram

Reputation: 303

How to ignore the line break while printing a string read from stdin?

I tried to write a bit of code which reads a name from stdin and prints it. The problem is the line breaks immediately after printing the variable and the characters following the variable are printed in the next line:

use std::io;

fn main() {
    println!("Enter your name:");
    let mut name = String::new();
    io::stdin().read_line(&mut name).expect("Failed To read Input");
    println!("Hello '{}'!", name);
}

The '!' is printed in the next line, which is not the expected location.

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Upvotes: 9

Views: 4399

Answers (2)

4e554c4c
4e554c4c

Reputation: 549

Use .trim() to remove whitespace on a string. This example should work.

use std::io;

fn main() {
    println!("Enter your name:");
    let mut name = String::new();
    io::stdin().read_line(&mut name).expect("Failed To read Input");
    println!("Hello '{}'!", name.trim());
}

There also trim_start() and .trim_end() if you need to remove whitespace changes from only one side of the string.

Upvotes: 12

Andra
Andra

Reputation: 1392

If you want to remove the last character only (in this case is newline character), you should use .pop() instead of .trim().

When you use .trim(), the leading and trailing whitespace(s) will be removed, so the space, tab, newline, and the other whitespace in the beginning and the end of the string will be removed.

use std::io;

fn main() {
    println!("Enter your name:");
    let mut name = String::new();
    io::stdin().read_line(&mut name).expect("Failed To read Input");
    name.pop();
    println!("Hello '{}'!", name);
}

Upvotes: 0

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