常量const包含不变的数据。此数据只能是布尔型, 数字（整数, 浮点数或复数）或字符串类型。
句法：
const identifier [type] = value
例：
const PI = 3.14159
类型说明符[type]是可选的, 编译器可以从值隐式派生类型。
显式键入示例：
const b string = "abc"
隐式键入示例：
const b = "abc"
转到常量示例
package main
import "fmt"
func main() {
const HEIGHT int = 100
const WIDTH int = 200
var area int
area = HEIGHT * WIDTH
fmt.Printf("value of area : %d", area)
}
输出：
value of area : 20000
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