test/bignum/bignum_test.go

package bignum_test

import (
	"fmt"
	"math/big"
	"testing"
)

func Test1(t *testing.T) {
	a := big.NewInt(1)
	for i := 1; i <= 100; i++ {
		a.Mul(a, big.NewInt(int64(i)))
		fmt.Println(i, "! = ", a)
	}
}

func Test2(t *testing.T) {
	a := big.NewFloat(0)
	b := big.NewFloat(1)
	c := big.NewFloat(1)
	d := big.NewFloat(4)
	e := big.NewFloat(1)
	for i := 1; i <= 10000000; i++ {
		n := 2*i - 1
		if i%2 == 0 {
			n = -n
		}
		b.Quo(c, big.NewFloat(float64(n)))
		a.Add(a, b)
		e.Mul(d, a)
		fmt.Println("[", i, "] = ", e)
	}
}