Idiom #192 Declare a real variable with at least 20 digits

Declare a real variable a with at least 20 digits; if the type does not exist, issue an error at compile time.

use rust_decimal::Decimal;
use std::str::FromStr;

let a = Decimal::from_str("1234567890.123456789012345").unwrap();

(def a 1234567890.12345678901M)

import "math/big"

a, _, err := big.ParseFloat("123456789.123456789123465789", 10, 200, big.ToZero)

import static java.math.RoundingMode.HALF_UP;
import java.math.BigDecimal;
import java.math.MathContext;

String pi = "3.14159265358979323846";
MathContext m = new MathContext(21, HALF_UP);
BigDecimal a = new BigDecimal(pi, m);

Do you know the best way to do this in your language ? New implementation...

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Idiom created by tkoenig

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