diff --git a/c01/ex03.c b/c01/ex03.c
new file mode 100644
index 0000000..7d6874b
--- /dev/null
+++ b/c01/ex03.c
@@ -0,0 +1,14 @@
+#include <stdio.h>
+void ft_div_mod(int a, int b, int *div, int *mod);
+int main(void)
+{
+	int x = 42;
+	int y = 5;
+	int d = -999;
+	int m = -666;
+
+	printf("was: %d %d /%d %%%d\n", x, y, d, m);
+	ft_div_mod(x, y, &d, &m);
+	printf("now: %d %d /%d %%%d\n", x, y, d, m);
+	return 0;
+}
diff --git a/c01/ex04.c b/c01/ex04.c
new file mode 100644
index 0000000..94b2cf0
--- /dev/null
+++ b/c01/ex04.c
@@ -0,0 +1,11 @@
+#include <stdio.h>
+void ft_ultimate_div_mod(int *a, int *b);
+int main()
+{
+	int m=42;
+	int n=5;
+	printf("was: =%d =%d\n", m, n);
+	ft_ultimate_div_mod(&m, &n);
+	printf("was: /%d %%%d\n", m, n);
+}
+
diff --git a/c01/ex05.c b/c01/ex05.c
new file mode 100644
index 0000000..3dcde55
--- /dev/null
+++ b/c01/ex05.c
@@ -0,0 +1,6 @@
+#include <stdio.h>
+void	ft_putstr(char *str);
+int main(void)
+{
+	ft_putstr("hello world!\0no!");
+}
diff --git a/c01/ex06.c b/c01/ex06.c
new file mode 100644
index 0000000..5d0971a
--- /dev/null
+++ b/c01/ex06.c
@@ -0,0 +1,8 @@
+#include <stdio.h>
+int	ft_strlen(char *str);
+int main(void)
+{
+	int l = ft_strlen("hello world!\0no!");
+
+	printf("len = %d\n", l);
+}
diff --git a/c01/ex07.c b/c01/ex07.c
new file mode 100644
index 0000000..2f836aa
--- /dev/null
+++ b/c01/ex07.c
@@ -0,0 +1,23 @@
+#include <stdio.h>
+void ft_rev_int_tab(int *tab, int size);
+
+void printarr(int *arr, int len)
+{
+	int i = 0;
+	while (i < len)
+	{
+		printf("%d ", arr[i]);
+		i++;
+	}
+}
+
+int main(void)
+{
+	int a[10] = {1, 3, 5, 7, 9, 11, 13, 15, 17};
+	int l = 9;
+
+	printarr(a, l);
+	printf("\n");
+	ft_rev_int_tab(a, l);
+	printarr(a, l);
+}
diff --git a/c01/ex08.c b/c01/ex08.c
new file mode 100644
index 0000000..7215f08
--- /dev/null
+++ b/c01/ex08.c
@@ -0,0 +1,23 @@
+#include <stdio.h>
+
+void printarr(int *arr, int len)
+{
+	int i = 0;
+	while (i < len)
+	{
+		printf("%d ", arr[i]);
+		i++;
+	}
+	printf("\n");
+}
+
+void ft_sort_int_tab(int *tab, int size);
+int main(void)
+{
+	int l = 21;
+	int a[21] = {4864, 3701, 20180, 26376, 32663, 15756, 18510, 1899, 9799, 13343, 25186, 7746, 8528, 7746, 11579, 4635, 25883, 23006, 3988, 21611, 26591};
+	printarr(a, l);
+	ft_sort_int_tab(a, l);
+	printarr(a, l);
+	return (0);
+}