diff --git a/HISTORY b/HISTORY
index 0897879..52d1e64 100755
--- a/HISTORY
+++ b/HISTORY
@@ -1,3 +1,6 @@
+Oct. 23 2016
+Fixed a percent symbol printing bug, thanks to Philip Bister for pointing it out
+
 Aug. 9 2016
 Added function overriding support for class instance
 Fixed a multiple disposing bug with GC
diff --git a/core/my_basic.c b/core/my_basic.c
index 50c117a..1cdf552 100755
--- a/core/my_basic.c
+++ b/core/my_basic.c
@@ -16081,7 +16081,7 @@ _print:
 				_DISPOSE_BUF(buf);
 				setlocale(LC_ALL, loc);
 #else /* MB_CP_VC && MB_ENABLE_UNICODE */
-				_get_printer(s)(val_ptr->data.string ? val_ptr->data.string : MB_NULL_STRING);
+				_get_printer(s)("%s", val_ptr->data.string ? val_ptr->data.string : MB_NULL_STRING);
 #endif /* MB_CP_VC && MB_ENABLE_UNICODE */
 				if(!val_ptr->ref && val_ptr->data.string && !pathed_str) {
 					safe_free(val_ptr->data.string);
@@ -16095,7 +16095,7 @@ _print:
 					while((lbuf = (size_t)val_ptr->data.usertype_ref->fmt(s, val_ptr->data.usertype_ref->usertype, _CHAR_BUF_PTR(buf), (unsigned)_CHARS_OF_BUF(buf))) > _CHARS_OF_BUF(buf)) {
 						_RESIZE_CHAR_BUF(buf, lbuf);
 					}
-					_get_printer(s)(_CHAR_BUF_PTR(buf));
+					_get_printer(s)("%s", _CHAR_BUF_PTR(buf));
 					_DISPOSE_BUF(buf);
 				} else {
 					_get_printer(s)(mb_get_type_string(_internal_type_to_public_type(val_ptr->type)));
diff --git a/my_basic_mac.xcodeproj/project.pbxproj b/my_basic_mac.xcodeproj/project.pbxproj
index 88b84a8..f63f655 100644
--- a/my_basic_mac.xcodeproj/project.pbxproj
+++ b/my_basic_mac.xcodeproj/project.pbxproj
@@ -101,7 +101,7 @@
 		03F4D7221A1D0081009F920C /* Project object */ = {
 			isa = PBXProject;
 			attributes = {
-				LastUpgradeCheck = 0710;
+				LastUpgradeCheck = 0800;
 				ORGANIZATIONNAME = "Wang Renxin";
 				TargetAttributes = {
 					03F4D7291A1D0081009F920C = {
@@ -152,8 +152,10 @@
 				CLANG_WARN_DIRECT_OBJC_ISA_USAGE = YES_ERROR;
 				CLANG_WARN_EMPTY_BODY = YES;
 				CLANG_WARN_ENUM_CONVERSION = YES;
+				CLANG_WARN_INFINITE_RECURSION = YES;
 				CLANG_WARN_INT_CONVERSION = YES;
 				CLANG_WARN_OBJC_ROOT_CLASS = YES_ERROR;
+				CLANG_WARN_SUSPICIOUS_MOVE = YES;
 				CLANG_WARN_UNREACHABLE_CODE = YES;
 				CLANG_WARN__DUPLICATE_METHOD_MATCH = YES;
 				COPY_PHASE_STRIP = NO;
@@ -161,6 +163,7 @@
 				ENABLE_TESTABILITY = YES;
 				GCC_C_LANGUAGE_STANDARD = gnu99;
 				GCC_DYNAMIC_NO_PIC = NO;
+				GCC_NO_COMMON_BLOCKS = YES;
 				GCC_OPTIMIZATION_LEVEL = 0;
 				GCC_PREPROCESSOR_DEFINITIONS = (
 					"DEBUG=1",
@@ -193,8 +196,10 @@
 				CLANG_WARN_DIRECT_OBJC_ISA_USAGE = YES_ERROR;
 				CLANG_WARN_EMPTY_BODY = YES;
 				CLANG_WARN_ENUM_CONVERSION = YES;
+				CLANG_WARN_INFINITE_RECURSION = YES;
 				CLANG_WARN_INT_CONVERSION = YES;
 				CLANG_WARN_OBJC_ROOT_CLASS = YES_ERROR;
+				CLANG_WARN_SUSPICIOUS_MOVE = YES;
 				CLANG_WARN_UNREACHABLE_CODE = YES;
 				CLANG_WARN__DUPLICATE_METHOD_MATCH = YES;
 				COPY_PHASE_STRIP = YES;
@@ -202,6 +207,7 @@
 				ENABLE_NS_ASSERTIONS = NO;
 				ENABLE_STRICT_OBJC_MSGSEND = YES;
 				GCC_C_LANGUAGE_STANDARD = gnu99;
+				GCC_NO_COMMON_BLOCKS = YES;
 				GCC_WARN_64_TO_32_BIT_CONVERSION = YES;
 				GCC_WARN_ABOUT_RETURN_TYPE = YES_ERROR;
 				GCC_WARN_UNDECLARED_SELECTOR = YES;
diff --git a/output/my_basic.exe b/output/my_basic.exe
index a5a2bbc..4019410 100755
Binary files a/output/my_basic.exe and b/output/my_basic.exe differ
diff --git a/output/my_basic_mac b/output/my_basic_mac
index 5b98596..36c0807 100755
Binary files a/output/my_basic_mac and b/output/my_basic_mac differ