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| Original file line number | Diff line number | Diff line change |
|---|---|---|
| @@ -0,0 +1,33 @@ | ||
| package datatypes | ||
|
|
||
| import ( | ||
| "math" | ||
| "math/big" | ||
| ) | ||
|
|
||
| var tenInt = big.NewInt(10) | ||
|
|
||
| func CountDigits(bi *big.Int) int { | ||
| if bi.IsInt64() { | ||
| i64 := bi.Int64() | ||
| // restrict fast path to integers with exact conversion to float64 | ||
| if i64 <= (1<<53) && i64 >= -(1<<53) { | ||
| if i64 == 0 { | ||
| return 1 | ||
| } | ||
| return int(math.Log10(math.Abs(float64(i64)))) + 1 | ||
| } | ||
| } | ||
|
|
||
| estimatedNumDigits := int(float64(bi.BitLen()) / math.Log2(10)) | ||
|
|
||
| // estimatedNumDigits (lg10) may be off by 1, need to verify | ||
| digitsBigInt := big.NewInt(int64(estimatedNumDigits)) | ||
| errorCorrectionUnit := digitsBigInt.Exp(tenInt, digitsBigInt, nil) | ||
|
|
||
| if bi.CmpAbs(errorCorrectionUnit) >= 0 { | ||
| return estimatedNumDigits + 1 | ||
| } | ||
|
|
||
| return estimatedNumDigits | ||
| } |
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| Original file line number | Diff line number | Diff line change |
|---|---|---|
| @@ -0,0 +1,38 @@ | ||
| package datatypes | ||
|
|
||
| import ( | ||
| "math/big" | ||
| "testing" | ||
| ) | ||
|
|
||
| func TestCountDigits(t *testing.T) { | ||
| bi := big.NewInt(-0) | ||
| expected := 1 | ||
| result := CountDigits(bi) | ||
| if result != expected { | ||
| t.Errorf("Unexpected result. Expected: %v, but got: %v", expected, result) | ||
| } | ||
|
|
||
| bi = big.NewInt(0) | ||
| expected = 1 | ||
| result = CountDigits(bi) | ||
| if result != expected { | ||
| t.Errorf("Unexpected result. Expected: %v, but got: %v", expected, result) | ||
| } | ||
|
|
||
| // 18 nines | ||
| bi = big.NewInt(999999999999999999) | ||
| result = CountDigits(bi) | ||
| expected = 18 | ||
| if result != expected { | ||
| t.Errorf("Unexpected result. Expected: %v, but got: %v", expected, result) | ||
| } | ||
|
|
||
| // 18 nines | ||
| bi = big.NewInt(-999999999999999999) | ||
| result = CountDigits(bi) | ||
| expected = 18 | ||
| if result != expected { | ||
| t.Errorf("Unexpected result. Expected: %v, but got: %v", expected, result) | ||
| } | ||
| } |
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