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43 lines
972 B
Go
43 lines
972 B
Go
// Parsing numbers from strings is a basic but common task
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// in many programs; here's how to do it in Go.
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package main
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// The built-in package `strconv` provides the number
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// parsing.
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import (
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"fmt"
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"strconv"
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)
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func main() {
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// With `ParseFloat`, this `64` tells how many bits of
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// precision to parse.
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f, _ := strconv.ParseFloat("1.234", 64)
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fmt.Println(f)
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// For `ParseInt`, the `0` means infer the base from
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// the string. `64` requires that the result fit in 64
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// bits.
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i, _ := strconv.ParseInt("123", 0, 64)
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fmt.Println(i)
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// `ParseInt` will recognize hex-formatted numbers.
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d, _ := strconv.ParseInt("0x1c8", 0, 64)
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fmt.Println(d)
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// A `ParseUint` is also available.
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u, _ := strconv.ParseUint("789", 0, 64)
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fmt.Println(u)
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// `Atoi` is a convenience function for basic base-10
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// `int` parsing.
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k, _ := strconv.Atoi("135")
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fmt.Println(k)
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// Parse functions return an error on bad input.
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_, e := strconv.Atoi("wat")
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fmt.Println(e)
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}
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