Conversion between Rust decimal and hexadecimal

Jun 9, 2023#rust1804

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In Rust, the format!() macro can be used to format decimal numbers as hexadecimal strings. The provided code shows a simple implementation of a function that converts a decimal number to a hexadecimal string using the {:X} format specifier. It also mentions that for larger numbers, the u64 or u128 types can be used. To convert a hexadecimal string back to a decimal number, the u64::from_str_radix() function can be used.

In Rust, you can use the format!() macro to format decimal numbers into hexadecimal strings. Here is a simple example implementation:

fn decimal_to_hex(decimal: u32) -> String {
    format!("{:X}", decimal)
}

Here, {} is used as the formatting string, which converts an unsigned decimal number into an uppercase hexadecimal string. For example, to convert the number 123456789 into a hexadecimal string, you can call the function like this:

let hex_string = decimal_to_hex(123456789);
println!("{}", hex_string); // Output: "75BCD15"

Note that if you need to handle larger numbers, you can use the u64 or u128 types. If you need to convert a hexadecimal string back into a decimal number, you can use the u64::from_str_radix() function. For example: