1.1 KiB
1.1 KiB
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If in Go |
If in Go
Go's if
statements are like its for
loops; the expression need not be surrounded by parentheses
(
)
but the braces {
}
are required.
func sqrt(x float64) string {
if x < 0 {
return sqrt(-x) + "i"
}
return fmt.Sprint(math.Sqrt(x))
}
Like for
, the if
statement can start with a short statement to execute before the condition.
Variables declared by the statement are only in scope until the end of the if
.
func pow(x, n, lim float64) float64 {
if v := math.Pow(x, n); v < lim {
return v
}
return lim
}
If and else
Variables declared inside an if
short statement are also available inside any of the else
blocks.
package main
import (
"fmt"
"math"
)
func pow(x, n, lim float64) float64 {
if v := math.Pow(x, n); v < lim {
return v
} else {
fmt.Printf("%g >= %g\n", v, lim)
}
// can't use v here, though
return lim
}
func main() {
fmt.Println(
pow(3, 2, 10),
pow(3, 3, 20),
)
}
Running the above program produces an output similar to the following output -
$ go run if.go
27 >= 20
9 20