extern crate serde;
extern crate serde_json;
extern crate serde_derive;

use serde_json::{Result};
use serde::{Deserialize};

#[derive(Deserialize, Debug)]
struct Info {
  info: Vec<ItemInfo>
}

#[derive(Deserialize, Debug)]
struct ItemInfo
{
  a: String,
  b: String,
  c: String,
  d: String
}

fn main() -> Result<()>
{
    let data = r#"
{
    "info": [
        {
            "a": "-0.000100000000000000000000000000",
            "b": "800000",
            "c": "0.010000000000000000000000000000",
            "d": "10000.000000000000000000000000000000"
        }
    ]
}"#;

    // Parse the string of data into serde_json::Value.
    let v: Info = serde_json::from_string(data)?;

    // Access parts of the data by indexing with square brackets.
    println!("a {}", v.info[0].a);

    Ok(())
}