1 files changed, 3 insertions, 0 deletions

diff --git a/math/abs.c b/math/abs.c
new file mode 100644
index 0000000..1bb7355
--- /dev/null
+++ b/math/abs.c
@@ -0,0 +1,3 @@
+#include "maths.h"
+
+extern int abs(int n) { return n < 0 ? -n : n; }