这个是 geometry.go
// geometry.go
package main

import (
    "fmt"
    "log"
    "third_go_modules/src/geometry/rectangle" // 导入自定义包
)
/*
* 1. 包级别变量
*/
var rectLen, rectWidth float64 = 6, 7

/*
*2. init 函数会检查长和宽是否大于0
*/
func init() {
    println("main package initialized")
    if rectLen < 0 {
        log.Fatal("length is less than zero")
        //fmt.Println("length is less than zero")
    }
    if rectWidth < 0 {
        log.Fatal("width is less than zero")
        //fmt.Println("width is less than zero")
    }
}
func main() {
    //fmt.Println("Geometrical shape properties")
    //var rectLen, rectWidth float64 = 6, 7
    fmt.Println("Geometrical shape properties")
    /*Area function of rectangle package used*/
    fmt.Printf("area of rectangle %.2f\n", rectangle.Area(rectLen, rectWidth))
    /*Diagonal function of rectangle package used*/
    fmt.Printf("diagonal of the rectangle %.2f ", rectangle.Diagonal(rectLen, rectWidth))
}
【 在 StephenLee 的大作中提到: 】
: 能放完整程序么，看起来 import 包并没有被调用
: - 来自「最水木 for iPhone13,2」
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