diff --git a/c-basic/backline.c b/c-basic/backline.c
new file mode 100644
index 0000000..4608f20
--- /dev/null
+++ b/c-basic/backline.c
@@ -0,0 +1,11 @@
+#include <stdio.h>
+
+int main()
+{
+
+  printf("c:\temp\a.dat\n");
+
+  printf("c:\\temp\\a.dat\n");
+
+  return 0;
+}