push all exercices

ch5/1/ch5_1.go

@@ -0,0 +1,20 @@
+package main
+
+import (
+	"errors"
+	"fmt"
+)
+
+func simpleCalculator(dividend, divisor int) (int, error) {
+	if divisor == 0 {
+		err := errors.New("division by zero")
+		return 0, err
+	}
+	return dividend / divisor, nil
+}
+
+func main() {
+	fmt.Println(simpleCalculator(5, 2))
+	fmt.Println(simpleCalculator(5, 0))
+	fmt.Println(simpleCalculator(17, 6))
+}

ch5/1/go.mod

@@ -0,0 +1,3 @@
+module ch5_1
+
+go 1.25.0