From fa81f98dba960a9a60aaf1b526a7665bcee64e67 Mon Sep 17 00:00:00 2001
From: JP Raynaud <jp.raynaud@gmail.com>
Date: Sat, 26 Feb 2022 13:40:19 +0100
Subject: [PATCH] Added integer addition example

---
 go/cmd/main.go   | 8 ++++++++
 go/cmd/rustlib.h | 5 ++++-
 rust/src/lib.rs  | 5 +++++
 3 files changed, 17 insertions(+), 1 deletion(-)

diff --git a/go/cmd/main.go b/go/cmd/main.go
index a278129..1e79b55 100644
--- a/go/cmd/main.go
+++ b/go/cmd/main.go
@@ -7,7 +7,15 @@ package main
 #include "./rustlib.h"
 */
 import "C"
+import "fmt"
 
 func main() {
+	// 1 - Hello
 	C.hello()
+
+	// 2 - Addition
+	x := C.uint32_t(10)
+	y := C.uint32_t(100)
+	add := uint(C.addition(x, y))
+	fmt.Printf("Addition=%d\r\n", add)
 }
diff --git a/go/cmd/rustlib.h b/go/cmd/rustlib.h
index cfc7be1..5fa208c 100644
--- a/go/cmd/rustlib.h
+++ b/go/cmd/rustlib.h
@@ -1 +1,4 @@
-extern int hello();
\ No newline at end of file
+#include <stdint.h>
+
+extern void hello();
+extern uint32_t addition(uint32_t, uint32_t);
\ No newline at end of file
diff --git a/rust/src/lib.rs b/rust/src/lib.rs
index cc7a582..f598c3f 100644
--- a/rust/src/lib.rs
+++ b/rust/src/lib.rs
@@ -2,3 +2,8 @@
 pub extern "C" fn hello() {
     println!("Hello World in Rust");
 }
+
+#[no_mangle]
+pub extern "C" fn addition(x: u32, y: u32) -> u32 {
+    x + y
+}