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num_test.go
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num_test.go
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package num
import (
"fmt"
"math/big"
"testing"
)
func Test1(t *testing.T) {
f1, _ := New(20, 2)
f2 := NewFromInt(20)
f3, _ := New(20, 2)
f3.reduce()
if f1.String() != f3.String() {
t.Errorf("Should be equal: %s %s\n", f1.String(), f3.String())
}
if f1.String() == f2.String() {
t.Errorf("Should be different: %s %s \n", f1.String(), f2.String())
}
}
func Test2(t *testing.T) {
f, _ := New(22, 2)
fmt.Println(f)
f, _ = New(33, 3)
fmt.Println(f)
}
func Test3(t *testing.T) {
var f *Frac
f, _ = New(16, -10)
fmt.Println(f)
f = NewFromInt(123)
fmt.Println(f)
fmt.Println(f)
f, _ = NewFromString("3/7")
fmt.Println(f)
f, _ = NewFromString("6/-14")
fmt.Println(f)
f, _ = NewFromString("-3/7")
fmt.Println(f)
}
func Test4(t *testing.T) {
x, _ := NewFromString("1/3")
y, _ := NewFromString("2/4")
x.Mul(y)
fmt.Println(x.String(), "looks nicer than", (1.0/3.0)*(2.0/4.0))
y.MulInt(2)
fmt.Println("y is", y.String())
z := x
z.Mul(y)
fmt.Println("z is", z.String(), z.Round(), "(", (1.0/3.0)*(2.0/4.0)*2*(2.0/4.0), ")")
}
func Test5(t *testing.T) {
x := NewFromInt(3)
y := NewFromInt(2)
x.Div(y)
fmt.Println(x.String(), x.Round())
x.DivInt(2)
fmt.Println(x.String(), x.Round())
}
func Test6(t *testing.T) {
var pi = 3.14159265359
fmt.Println("num dom i", "\t\t", "fraction", "\t", "float", "\t\t", "rounded")
f := NewFromFloat64(0.5, I)
exact := f.ExactFloat64()
fmt.Println(f, "\t\t", f.String(), "\t\t", f.Float64(), "\t\texact:", exact, "\t\trounded:", f.Round())
f = NewFromFloat64(pi, 10000)
exact = f.ExactFloat64()
fmt.Println(f, "\t", f.String(), "\t", f.Float64(), "\texact:", exact, "\t\trounded:", f.Round())
}
func Test7(t *testing.T) {
x := NewFromFloat64(0.7, I)
y := NewFromFloat64(0.5, I)
x.AddInt(2)
fmt.Println("0.7 + 2 =", x.String(), x.Round(), x.Float64(), 0.7+2)
y.SubInt(4)
fmt.Println("0.5 - 4 =", y.String(), y.Round(), y.Float64(), 0.5-4)
}
func Test8(t *testing.T) {
x, _ := New(1, 3)
y, _ := New(1, 2)
fmt.Println(" ", x.String(), x.Float64())
fmt.Println("+", y.String(), y.Float64())
x.Add(y)
fmt.Println("=", x.String(), x.Float64())
}
func Test9(t *testing.T) {
x, _ := New(1, 2)
y, _ := New(1, 3)
fmt.Println(" ", x.String(), x.Float64())
fmt.Println("-", y.String(), y.Float64())
x.Sub(y)
fmt.Println("=", x.String(), x.Float64())
}
func Test10(t *testing.T) {
x, _ := New(3, 2)
i, f := x.Splitup()
fmt.Printf("%s is also %d+%s\n", x, i, f)
}
func Test11(t *testing.T) {
r := big.NewRat(3, 9)
f := NewFromRat(r)
fmt.Println("One third:", r, f)
rfloat, exact := r.Float64()
ffloat := f.Float64()
fmt.Println("One third:", rfloat, "(exact:", exact, ")", ffloat)
f.SetMaxReduceIterations(4)
fmt.Println(f.Float64())
f = NewFromRat(r)
fmt.Println(f.ExactFloat64())
r = big.NewRat(2, 4)
f = NewFromRat(r)
//f.SetMaxReduceIterations(-1)
_, exact = r.Float64()
if exact != f.ExactFloat64() {
t.Errorf("Both should be exact: %s %s (%v %v)", r, f, exact, f.ExactFloat64())
}
}
func ExampleSqrt() {
x := NewFromInt(9)
fmt.Println(Sqrt(x).Float64())
// Output:
// 3
}
func ExampleUnicode() {
//x, _ := New(3, 47)
x := NewFromFloat64(0.06382978723404255, L)
fmt.Println(x)
// Output:
// 3⁄47
}