push all exercices

ch2/3/ch3_2.go

@@ -0,0 +1,15 @@
+package main
+
+import "fmt"
+
+func main() {
+	var b byte = 255
+	var smallI int32 = 2147483647
+	var bigI uint64 = 18446744073709551615
+	b += 1
+	smallI += 1
+	bigI += 1
+	fmt.Println(b)
+	fmt.Println(smallI)
+	fmt.Println(bigI)
+}