From 4bf149795acea088b349be89cb7992a6d413ad9f Mon Sep 17 00:00:00 2001
From: Andrew Kelley <superjoe30@gmail.com>
Date: Sun, 1 Oct 2017 12:40:30 -0400
Subject: [PATCH] update hello world examples

edge cases matter

See #510
---
 example/hello_world/hello.zig      |  2 +-
 example/hello_world/hello_libc.zig | 11 +++++++++--
 2 files changed, 10 insertions(+), 3 deletions(-)

diff --git a/example/hello_world/hello.zig b/example/hello_world/hello.zig
index 03eab6ac56..d723ad284c 100644
--- a/example/hello_world/hello.zig
+++ b/example/hello_world/hello.zig
@@ -1,5 +1,5 @@
 const io = @import("std").io;
 
 pub fn main() -> %void {
-    %%io.stdout.printf("Hello, world!\n");
+    %return io.stdout.printf("Hello, world!\n");
 }
diff --git a/example/hello_world/hello_libc.zig b/example/hello_world/hello_libc.zig
index ea8a9df38e..22c0ee784d 100644
--- a/example/hello_world/hello_libc.zig
+++ b/example/hello_world/hello_libc.zig
@@ -1,6 +1,13 @@
-const c = @cImport(@cInclude("stdio.h"));
+const c = @cImport({
+    @cInclude("stdio.h");
+    @cInclude("string.h");
+});
+
+const msg = c"Hello, world!\n";
 
 export fn main(argc: c_int, argv: &&u8) -> c_int {
-    _ = c.printf(c"Hello, world!\n");
+    if (c.printf(msg) != c_int(c.strlen(msg)))
+        return -1;
+
     return 0;
 }