diff --git a/modernc/05/.gitignore b/modernc/05/.gitignore
new file mode 100644
index 0000000..15a13db
--- /dev/null
+++ b/modernc/05/.gitignore
@@ -0,0 +1 @@
+basic
diff --git a/modernc/05/basic.c b/modernc/05/basic.c
new file mode 100644
index 0000000..7d982c3
--- /dev/null
+++ b/modernc/05/basic.c
@@ -0,0 +1,9 @@
+#include <stdio.h>
+
+int main() {
+	double x = 5.0;
+	double y = 3.0;
+
+	x = (x * 1.5) - y;
+	printf("x is \%g\n", x);
+}