alchemy/examples/convert_f32.rs

#![feature(convert)]

extern crate alchemy;


use alchemy::F32_BYTES;
use alchemy::{Converter, PlatformEndian};



pub fn main()
{
   let num: f32;
   let final_num: f32;
   let mut buffer: [u8; F32_BYTES];

   // Initialize the variables.
   num = 6.291985f32;
   buffer = [0u8; F32_BYTES];

   println!("Converting the value {} into and out of an array of bytes.", num);
   println!("Buffer starts as: {}", stringify_array(&buffer));

   // Convert the floating point number into an array of bytes.
   PlatformEndian::f32_to_bytes(&mut buffer, num);

   println!("Buffer contains: {}", stringify_array(&buffer));

   // Convert the array of bytes into a floating point number.
   final_num = PlatformEndian::bytes_to_f32(&buffer);
   println!("The buffer converts back to: {}", final_num);
}

/// This just help pretty up the printing of an array of bytes.
fn stringify_array(buffer: &[u8]) -> String
{
   let mut result: String;
   let mut count: usize;

   // Create a new string that starts with just
   // the array opening bracket.
   result = String::new();
   result.push_str("[");

   // Loop through the buffer keeping track
   // of our place in it.
   count = 0usize;
   for byte in buffer
   {
      // Handle priting the last value differently.
      if count >= buffer.len() - 1
      {
         result.push_str(byte.to_string().as_str());
      }
      else
      {
         result.push_str(byte.to_string().as_str());
         result.push_str(", ");
      }

      // Mark that we are going to look at
      // the next byte in the array.
      count += 1;
   }

   // Add the array closing bracket and
   // return the new String.
   result.push_str("]");
   result
}