initial commit

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 
+

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))

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
+