trying_out_go/playground/wallArea.go

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package main
import "fmt"
func paintNeeded(width float64, height float64) (paintNeededCalculated float64, anError error) {
area := width * height
if width < 0.0 {
return 0, fmt.Errorf("a width of %0.2f is invalid.", width)
}
if height < 0.0 {
return 0, fmt.Errorf("a height of %0.2f is invalid.", height)
}
return area / 10.0, nil
}
func printListersNeeded(amount float64) {
fmt.Printf("%.2f liters needed\n", amount)
}
func wallArea() {
var amount, total float64
amount, err := paintNeeded(4.2, 3.0)
if err != nil {
fmt.Println(err)
} else {
printListersNeeded(amount)
}
total += amount
amount, err = paintNeeded(-5.2, 3.5)
if err != nil {
fmt.Println(err)
} else {
printListersNeeded(amount)
}
total += amount
amount, err = paintNeeded(5.2, 5.0)
if err != nil {
fmt.Println(err)
} else {
printListersNeeded(amount)
}
total += amount
fmt.Printf("Total: %.2f liters\n", total)
}