從字符串解析數(shù)字是許多程序中的一個(gè)基本但常見的任務(wù); 這里是演示如何在Go編程中使用。內(nèi)置包strconv提供數(shù)字解析。
可參考示例中的代碼 -
所有的示例代碼,都放在
F:\worksp\golang目錄下。安裝Go編程環(huán)境請(qǐng)參考:http://www.yiibai.com/go/go_environment.html
number-parsing.go的完整代碼如下所示 -
package main
// The built-in package `strconv` provides the number
// parsing.
import "strconv"
import "fmt"
func main() {
// With `ParseFloat`, this `64` tells how many bits of
// precision to parse.
f, _ := strconv.ParseFloat("1.234", 64)
fmt.Println(f)
// For `ParseInt`, the `0` means infer the base from
// the string. `64` requires that the result fit in 64
// bits.
i, _ := strconv.ParseInt("123", 0, 64)
fmt.Println(i)
// `ParseInt` will recognize hex-formatted numbers.
d, _ := strconv.ParseInt("0x1c8", 0, 64)
fmt.Println(d)
// A `ParseUint` is also available.
u, _ := strconv.ParseUint("789", 0, 64)
fmt.Println(u)
// `Atoi` is a convenience function for basic base-10
// `int` parsing.
k, _ := strconv.Atoi("135")
fmt.Println(k)
// Parse functions return an error on bad input.
_, e := strconv.Atoi("wat")
fmt.Println(e)
}
執(zhí)行上面代碼,將得到以下輸出結(jié)果 -
F:\worksp\golang>go run number-parsing.go
1.234
123
456
789
135
strconv.ParseInt: parsing "wat": invalid syntax