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basic.go
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basic.go
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package main
import (
"fmt"
"math"
"math/cmplx"
)
var (
aa = 3
ss = "kkk"
bb = true
)
func variableZeroValue() {
var a int
var s string
fmt.Printf("%d %q\n", a, s)
}
func variableInitialValue() {
var a, b int = 3, 4
var s string = "abc"
fmt.Println(a, b, s)
}
func variableTypeDeduction() {
var a, b, c, s = 3, 4, true, "def"
fmt.Println(a, b, c, s)
}
func variableShorter() {
a, b, c, s := 3, 4, true, "def"
b = 5
fmt.Println(a, b, c, s)
}
func euler() {
fmt.Printf("%.3f\n",
cmplx.Exp(1i*math.Pi)+1)
}
func triangle() {
var a, b int = 3, 4
fmt.Println(calcTriangle(a, b))
}
func calcTriangle(a, b int) int {
var c int
c = int(math.Sqrt(float64(a*a + b*b)))
return c
}
func consts() {
const (
filename = "abc.txt"
a, b = 3, 4
)
var c int
c = int(math.Sqrt(a*a + b*b))
fmt.Println(filename, c)
}
func enums() {
const (
cpp = iota
_
python
golang
javascript
)
const (
b = 1 << (10 * iota)
kb
mb
gb
tb
pb
)
fmt.Println(cpp, javascript, python, golang)
fmt.Println(b, kb, mb, gb, tb, pb)
}
func main() {
fmt.Println("Hello world")
variableZeroValue()
variableInitialValue()
variableTypeDeduction()
variableShorter()
fmt.Println(aa, ss, bb)
euler()
triangle()
consts()
enums()
}