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.

  integer, parameter :: qp = selected_real_kind(20)
  real(kind=qp) :: a

(def a 1234567890.12345678901M)

decimal 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);

use bignum;

my $a = 12345678901234567890.1234567890123456789012345678901234567890123456789012345678901234567890123456789012345678901234567890;

import decimal

a = decimal.Decimal('1234567890.123456789012345')

require 'bigdecimal'

a = BigDecimal('1234567890.12345678901')

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

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

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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