From a0d8cd87b74114f101c4b7d49d0aa7d3a970f186 Mon Sep 17 00:00:00 2001
From: ergz <e.emanuel.rodriguez@gmail.com>
Date: Fri, 24 Mar 2023 15:59:23 -0700
Subject: [PATCH] initial commit

---
 eight-queen.lua | 25 +++++++++++++++++++++++++
 hello.lua       | 16 ++++++++++++++++
 lib1.lua        |  8 ++++++++
 3 files changed, 49 insertions(+)
 create mode 100644 eight-queen.lua
 create mode 100644 hello.lua
 create mode 100644 lib1.lua

diff --git a/eight-queen.lua b/eight-queen.lua
new file mode 100644
index 0000000..c36eb05
--- /dev/null
+++ b/eight-queen.lua
@@ -0,0 +1,25 @@
+N = 8 -- size of the board
+
+
+-- check whether position (n, c) is free from attacks 
+function is_place_ok (a, n, c)
+    for i = 1, n - 1 do -- leaving the inc/dec value empty defaults to +1 
+        if (a[i] == c) or 
+            (a[i] - i == c - n) or 
+            (a[i] + i == c + n) then
+            return false
+        end
+    end
+    return true
+end 
+
+function print_solution (a)
+    for i = 1, N, 1 do
+        for j = 1, N, 1 do 
+            io.write(a[i] == j and "X" or "-", " ")
+        end
+        io.write("\n")
+    end 
+    io.write("\n")
+end 
+
diff --git a/hello.lua b/hello.lua
new file mode 100644
index 0000000..1280f39
--- /dev/null
+++ b/hello.lua
@@ -0,0 +1,16 @@
+print("hello world!")
+
+function fact (n)
+    if n < 0 then
+        print("factorial for a negative number is not defined!")
+        os.exit()m
+    elseif n == 0 then
+        return 1
+    else 
+        return n * fact(n - 1)
+    end
+end
+
+print("enter a number")
+a = io.read("*n")
+print(fact(a))
diff --git a/lib1.lua b/lib1.lua
new file mode 100644
index 0000000..611b9fc
--- /dev/null
+++ b/lib1.lua
@@ -0,0 +1,8 @@
+function norm (x, y)
+    return math.sqrt(x^2 + y^2)
+end
+
+function twice (x)
+    return 2.0 * x
+end
+