Question

How to declare a real variable with at least 20 digits in Go

Answer 1

package main

import (
    "fmt"
    "math/big"
)

func main() {
    input := "1234567890.1234567890123"

    // func ParseFloat(s string, base int, prec uint, mode RoundingMode) (f *Float, b int, err error)
    result, _, err := big.ParseFloat(input, 10, 200, big.ToZero)
    if err != nil {
        panic(err)
    }

    // Print the float with exact formatting
    fmt.Println(result.Text('f', len(input))) 
}



/*
run:

1234567890.123456789012300000000000

*/

 

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