Exact() works like String() with <= 16 digits in mantissa.

keep94 · Sep 12, 2024 · 2ef645a · 2ef645a
1 parent 2ad3f29
commit 2ef645a
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Showing 2 changed files with 10 additions and 3 deletions.
diff --git a/v3/sqroot.go b/v3/sqroot.go
@@ -308,7 +308,7 @@ func (n *FiniteNumber) Format(state fmt.State, verb rune) {
 // the exact representation of n.
 func (n *FiniteNumber) Exact() string {
 	var builder strings.Builder
-	fs := formatSpecForG(endOf(n), n.exponent, false)
+	fs := formatSpecForG(max(endOf(n), gPrecision), n.exponent, false)
 	fs.PrintNumber(&builder, n)
 	return builder.String()
 }

diff --git a/v3/sqroot_test.go b/v3/sqroot_test.go
@@ -208,8 +208,8 @@ func TestExactShort(t *testing.T) {
 	n, _ := NewNumberForTesting([]int{5, 0, 0, 1}, nil, 3)
 	assert.Equal(t, "500.1", n.WithSignificant(20).Exact())
 	assert.Equal(t, "500", n.WithSignificant(3).Exact())
-	assert.Equal(t, "0.50e+03", n.WithSignificant(2).Exact())
-	assert.Equal(t, "0.5e+03", n.WithSignificant(1).Exact())
+	assert.Equal(t, "500", n.WithSignificant(2).Exact())
+	assert.Equal(t, "500", n.WithSignificant(1).Exact())
 	assert.Equal(t, "0", n.WithSignificant(0).Exact())
 	smallN := n.withExponent(-3)
 	assert.Equal(t, "0.0005001", smallN.WithSignificant(4).Exact())
@@ -228,6 +228,13 @@ func TestNewFiniteNumber(t *testing.T) {
 	assert.Equal(t, "20.5", n.Exact())
 }
 
+func TestNewBigFiniteNumber(t *testing.T) {
+	n, err := NewFiniteNumber([]int{2, 0, 5}, 4)
+	assert.NoError(t, err)
+	assert.Equal(t, "2050", n.String())
+	assert.Equal(t, "2050", n.Exact())
+}
+
 func TestNewFiniteNumberZero(t *testing.T) {
 	n, err := NewFiniteNumber(nil, 2)
 	assert.NoError(t, err)