示例代码请访问：[https://github.com/wenjianzhang](https://github.com/wenjianzhang)
## 编写测试程序
1. 源码文件以_test结尾;例如:xxx_test.go
1. 测试方法名以Test开头;例如:func TestXXXXX(t *testing.T){}
## 实现斐波那且数列
```go
package fib
import (
"fmt"
"testing"
)
func TestFibList(t *testing.T) {
// 第一种赋值方式
//var a int =1
//var b int =1
// 第二种赋值方式
//var (
// a int = 1
// b = 1
//)
// 第三种赋值方式
a := 1
b := 1
fmt.Print(a)
for i := 0; i < 5; i++ {
fmt.Print(" ", b)
tmp := a
a = b
b = tmp + a
}
fmt.Println()
}
```
代码里边给出了三种赋值方式：
> one
```go
var a int =1 一般全局变量，或者外部变量
```
> two
```go
var (
a int = 1
b = 1
)
```
> three go语言可以不使用关键字，使用类型推断直接给变量设置类型
```go
a := 1
```
## 变量赋值
* 赋值可以进行自动类型推断
* 在一个赋值语句中可以对多个变量进行同时赋值
```go
func TestExchang(t *testing.T) {
a := 1
b := 1
// 1 常见写法
//tmp := a
//a = b
//b = tmp
//
// 2 go 特性：多个变量进行同时赋值
a, b = b, a
t.Log(a, b)
}
```
两点需要注意
1. 常见写法
```go
tmp := a
a = b
b = tmp
```
2. go 特性：多个变量进行同时赋值
```go
a, b = b, a
```
## 常量定义
快速设置连续值
```go
const (
Monday = iota + 1
Tuesday
Wednesday
Thursday
Friday
Saturday
Sunday
)
const (
Open = 1 << iota
Close
Pending
)
```
测试代码
```go
package constart_test
import (
"testing"
)
const (
Monday = iota + 1
Tuesday
Wednesday
Thursday
Friday
Saturday
Sunday
)
const (
Open = 1 << iota //0001
Close //0010
Pending //0011
)
func TestConstantTry(t *testing.T) {
t.Log(Monday, Tuesday, Wednesday, Thursday, Friday, Saturday, Sunday)
}
func TestConstantTry1(t *testing.T) {
a := 6
t.Log(uint8(a), uint(Open), uint(Close), uint(Pending))
c := a & Open
t.Logf("第一行 - c 的值为 %d\n", c)
c = a & Close
t.Logf("第一行 - c 的值为 %d\n", c)
c = a & Pending
t.Logf("第一行 - c 的值为 %d\n", c)
t.Log(a&Open == Open, a&Close == Close, a&Pending == Pending)
}
```
输出
```shell
--- PASS: TestConstantTry (0.00s)
constant_try_test.go:24: 1 2 3 4 5 6 7
=== RUN TestConstantTry1
--- PASS: TestConstantTry1 (0.00s)
constant_try_test.go:30: 6 1 2 4
constant_try_test.go:32: 第一行 - c 的值为 0
constant_try_test.go:34: 第一行 - c 的值为 2
constant_try_test.go:36: 第一行 - c 的值为 4
constant_try_test.go:37: false true true
PASS
Process finished with exit code 0
```
示例代码请访问：[https://github.com/wenjianzhang](https://github.com/wenjianzhang)
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