diff --git a/stack_functions/swap.c b/stack_functions/swap.c
new file mode 100644
index 0000000..67430fb
--- /dev/null
+++ b/stack_functions/swap.c
@@ -0,0 +1,45 @@
+/* ************************************************************************** */
+/*                                                                            */
+/*                                                        :::      ::::::::   */
+/*   swap.c                                             :+:      :+:    :+:   */
+/*                                                    +:+ +:+         +:+     */
+/*   By: mteriier <mteriier@student.42lyon.fr>      +#+  +:+       +#+        */
+/*                                                +#+#+#+#+#+   +#+           */
+/*   Created: 2025/12/08 14:48:44 by mteriier          #+#    #+#             */
+/*   Updated: 2025/12/08 15:04:39 by mteriier         ###   ########lyon.fr   */
+/*                                                                            */
+/* ************************************************************************** */
+
+#include "push_swap.h"
+
+void	sa(t_stacks *stacks)
+{
+	t_stack	a;
+	int		stock;
+
+	if (!stacks || !stacks->a || !stacks->a->next)
+		return ;
+	a = stacks->a;
+	stock = a->value;
+	a->value = a->next->value;
+	a->next->value = stock;
+}
+
+void	sb(t_stacks *stacks)
+{
+	t_stack	b;
+	int		stock;
+
+	if (!stacks || !stacks->b || !stacks->b->next)
+		return ;
+	b = stacks->b;
+	stock = b->value;
+	b->value = b->next->value;
+	b->next->value = stock;
+}
+
+void	ss(t_stacks *stacks)
+{
+	sa(stacks);
+	sb(stacks);
+}