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course/6-errors/exercises/3-custom_errors/code.go

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+package main
+
+import (
+	"fmt"
+)
+
+type divideError struct {
+	dividend float64
+}
+
+// ?
+
+// don't edit below this line
+
+func divide(dividend, divisor float64) (float64, error) {
+	if divisor == 0 {
+		// We convert the `divideError` struct to an `error` type by returning it
+		// as an error. As an error type, when it's printed its default value
+		// will be the result of the Error() method
+		return 0, divideError{dividend: dividend}
+	}
+	return dividend / divisor, nil
+}
+
+func test(dividend, divisor float64) {
+	defer fmt.Println("====================================")
+	fmt.Printf("Dividing %.2f by %.2f ...\n", dividend, divisor)
+	quotient, err := divide(dividend, divisor)
+	if err != nil {
+		fmt.Println(err)
+		return
+	}
+	fmt.Printf("Quotient: %.2f\n", quotient)
+}
+
+func main() {
+	test(10, 0)
+	test(10, 2)
+	test(15, 30)
+	test(6, 3)
+}