add: graphs et rushs

1 files changed, 21 insertions, 0 deletions

diff --git a/graphs/piscine/fibo_iter/fibo_iter.c b/graphs/piscine/fibo_iter/fibo_iter.c
new file mode 100644
index 0000000..36ebf46
--- /dev/null
+++ b/graphs/piscine/fibo_iter/fibo_iter.c
@@ -0,0 +1,21 @@
+#include <stdio.h>
+
+unsigned long fibo_iter(unsigned long n)
+{
+    if (n == 0)
+    {
+        return 0;
+    }
+    unsigned long prev = 1;
+    unsigned long pprev = 0;
+    unsigned long i;
+
+    for (i = 1; i < n; i++)
+    {
+        unsigned long next = pprev + prev;
+        pprev = prev;
+        prev = next;
+    }
+
+    return prev;
+}