Basic Formatting

A single placeholder is used when it is required to print a single value.

  fn main() {
    println!("Number: {}", 1);
}

We can use multiple placeholders within the println!() macro. The number of placeholders should be equal to the number of values to be printed.

  fn main() {
    println!("{} is a {} Community", "Join", "CloudNativeFolks");
}

If we want to convert the value to binary, hexadecimal, or octal write:

  {:b},{:x},{:o}

In the placeholder for binary, hexadecimal, or octal respectively and in the value specify the number. You can use all three of them or one of them in a single expression.

  fn main() {
    println!("Number : 10 \nBinary:{:b} Hexadecimal:{:x} Octal:{:o}", 10, 10, 10);
}

If we want to convert the value to binary, hexadecimal, or octal write:

  {:b},{:x},{:o}

In the placeholder for binary, hexadecimal, or octal respectively and in the value specify the number. You can use all three of them or one of them in a single expression.

  fn main() {
    println!("Number : 10 \nBinary:{:b} Hexadecimal:{:x} Octal:{:o}", 10, 10, 10);
}

We can perform basic math and the placeholder gets replaced with the result.

  fn main() {
    println!("{} + {} = {}",10, 10, 10 + 10);
}

Placeholder for debug trait 

  fn main() {
    println!("{:?}", ("This is a Rustlabs", 101));
}

Knowledge check

--- primaryColor: steelblue secondaryColor: '#e8e8e8' textColor: black shuffleQuestions: false shuffleAnswers: true locale: en --- ## What is the output of the following code? ``` fn main() { println!("Enhance your coding skills from {1} courses. {0} courses are very {1}", "rustlabs", "interactive"); } ``` - [ ] Enhance your coding skills from kubedaily courses. kubedaily courses are very interactive
- [ ] Enhance your coding skills from interactive courses. kubedaily courses are very interactive
## What is the output of the following code? ``` fn main() { println!("{}{}", 2, 1); } ``` - [ ] 21 - [ ] 12
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Last updated 25 Jan 2024, 05:11 +0530 . history