diff --git a/3_data_types.exe b/3_data_types.exe
deleted file mode 100644
index 89c8cd0..0000000
Binary files a/3_data_types.exe and /dev/null differ
diff --git a/4_constant_variables.c b/4_constant_variables.c
new file mode 100644
index 0000000..a0504c7
--- /dev/null
+++ b/4_constant_variables.c
@@ -0,0 +1,12 @@
+#include <stdio.h>
+
+int main() {
+	
+	const int id = 12038921;
+	const char characters = 'Z';
+	
+	printf("%d\n", id);
+	printf("%c\n", characters);
+	
+	return 0;
+}
\ No newline at end of file