How to Convert Strings into Uppercase and Lower case in Rust example

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Feb 24, 2024
Rust

How to Convert Strings into Uppercase and Lower case in Rust example

Rust

This program demonstrates multiple ways to convert a string to uppercase in Rust, along with examples.

For example, if the given string is “Hello”, the output for uppercase would be “HELLO”.

How to Convert a Lowercase String to Uppercase in Rust?

Let’s explore how to convert a string to uppercase in Rust.

There are several methods to achieve this.

Using the to_uppercase Function
The to_uppercase function returns the uppercase version of a string.
Here’s an example program:
```
fn main() {
    let str = "Hello World";
    println!(" {}", str.to_uppercase());
}
```
Output:
```
HELLO WORLD
```
Using the to_ascii_uppercase Function
The to_ascii_uppercase function returns the uppercase version of ASCII characters in a string. Non-ASCII characters remain unchanged.
For example, ASCII characters such as a to z are converted to A to Z. Non-ASCII characters are not changed and return the same.
Here is an example program
```
fn main() {
    let str = "Hello World";
    println!(" {}", str.to_ascii_uppercase());
}
```
Output:
```
HELLO WORLD
```

How to Convert a String to Lowercase in Rust?

Let’s explore how to convert a string to lowercase in Rust. Each uppercase character in a string is converted to lowercase.

Using the to_ascii_lowercase Function
The to_ascii_lowercase function returns the lowercase of an ASCII character in a string. For example ASCII characters such as A to Z are converted to a to z. Non-ASCII characters are not changed and return the same.
Here is an example program
```
fn main() {
    let str = "Hello World";
    println!(" {}", str.to_ascii_lowercase());
}
```
Output:
```
hello world
```
Using the to_lowercase Function
The to_lowercase function returns the lowercase of a string.
Here is an example program
```
fn main() {
    let str = "HELLO WORLD";
    println!(" {}", str.to_lowercase());
}
```
Output:
```
hello world
```

Conclusion

In this article, we’ve learned multiple methods with examples on how to,

Convert a string into an uppercase string.
Convert a string into a lowercase string.

#Rust