diff --git a/build/c_hello b/build/c_hello
deleted file mode 100755
index 308c236..0000000
Binary files a/build/c_hello and /dev/null differ
diff --git a/build/hello b/build/hello
deleted file mode 100755
index 82dd0e3..0000000
Binary files a/build/hello and /dev/null differ
diff --git a/example2.c b/example2.c
deleted file mode 100644
index 1af1efb..0000000
--- a/example2.c
+++ /dev/null
@@ -1,6 +0,0 @@
-#include <stdio.h>
-
-int main (void) {
-    printf("Two plus two is %f\n", 4);
-    return 0;
-}
diff --git a/hello.F90 b/hello.F90
deleted file mode 100644
index 5827201..0000000
--- a/hello.F90
+++ /dev/null
@@ -1,5 +0,0 @@
-program hello
-  ! this is comment line
-
-  print *, "hello world!"
-end program hello
diff --git a/hello.c b/hello.c
deleted file mode 100644
index f8317f2..0000000
--- a/hello.c
+++ /dev/null
@@ -1,6 +0,0 @@
-#include <stdio.h>
-
-int main (void) {
-    printf("Hello, world!\n");
-    return 0;
-}