56 lines
1.5 KiB
Go
56 lines
1.5 KiB
Go
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package biginthelper
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import (
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"fmt"
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"math/rand"
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"strconv"
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"strings"
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"testing"
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)
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func Test_ParseBigInt(t *testing.T) {
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fmt.Println(ParseBigInt(`231513`))
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fmt.Println(ParseBigInt(`654wdf16`))
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fmt.Println(ParseBigInt(`5455_1655`))
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fmt.Println(ParseBigInt(``))
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fmt.Println(ParseBigInt(`af`))
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}
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func Test_IntToHex(t *testing.T) {
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fmt.Println(strings.TrimLeft(`01615`, "0"))
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fmt.Println(strings.TrimLeft(`1615`, "0"))
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fmt.Println(strings.TrimLeft(`0x1615`, "0"))
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}
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// i := int64(32)
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// s := strconv.FormatInt(i, 16)
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// println(s)
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// 对比strconv.FormatInt(i, 16)和fmt.Sprintf("0x%x", i)的性能消耗
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// go test -bench=_QE_ -benchmem
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// -benchtime 默认为1秒 -benchmem 获得内存分配的统计数据
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func Benchmark_QE_strconv(b *testing.B) {
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for i := 0; i < b.N; i++ {
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strconv.FormatInt(getInt64(), 16)
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}
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}
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func Benchmark_QE_fmt(b *testing.B) {
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for i := 0; i < b.N; i++ {
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fmt.Sprintf("0x%x", getInt64())
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}
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}
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func getInt64() int64 {
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return int64(rand.Intn(10000))
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}
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// 结果
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// Benchmark_QE_strconv-6 47142570 24.29 ns/op 5 B/op 1 allocs/op
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// Benchmark_QE_fmt-6 14787649 82.41 ns/op 8 B/op 1 allocs/op
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// 改为随机数后
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// Benchmark_QE_strconv-6 27890760 42.48 ns/op 3 B/op 0 allocs/op
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// Benchmark_QE_fmt-6 10595380 108.6 ns/op 15 B/op 1 allocs/op
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// 结论 尽量使用 strconv.FormatInt(i, 16) 进行16进制的转换
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