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31 lines
715 B
31 lines
715 B
//geometry.go
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package main
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import (
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"fmt"
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"golang-tutorial/geometry/rectangle" //importing custom package
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"log"
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)
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/*
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* 1. package variables
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*/
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var rectLen, rectWidth float64 = -6, 7
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/*
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*2. init function to check if length and width are greater than zero
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*/
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func init() {
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println("main package initialized")
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if rectLen < 0 {
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log.Fatal("length is less than zero")
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}
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if rectWidth < 0 {
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log.Fatal("width is less than zero")
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}
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}
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func main() {
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fmt.Println("Geometrical shape properties")
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fmt.Printf("area of rectangle %.2f\n", rectangle.Area(rectLen, rectWidth))
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fmt.Printf("diagonal of the rectangle %.2f ",rectangle.Diagonal(rectLen, rectWidth))
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} |