initialize

5 files changed, 70 insertions, 0 deletions

diff --git a/lua/1.lua b/lua/1.lua
new file mode 100755
index 0000000..647dfd3
--- /dev/null
+++ b/lua/1.lua
@@ -0,0 +1,3 @@
+x = "Hello World!"
+
+print(x)
diff --git a/lua/2.lua b/lua/2.lua
new file mode 100755
index 0000000..a5a2374
--- /dev/null
+++ b/lua/2.lua
@@ -0,0 +1,15 @@
+function fact (n)
+    if n == 0 then
+        return 1
+    else
+        return n * fact(n-1)
+    end
+end
+
+print("enter a number: ")
+a = io.read("*n")   -- Read a number
+if a < 0 then
+    print(a .. "negative")
+    return 1;
+end
+print(fact(a))
diff --git a/lua/3.lua b/lua/3.lua
new file mode 100755
index 0000000..2106d37
--- /dev/null
+++ b/lua/3.lua
@@ -0,0 +1,7 @@
+function norm (x,y)
+    return math.sqrt(x^2+y^2);
+end
+
+function twice(x)
+    return 2.0 * x;
+end
diff --git a/lua/4.lua b/lua/4.lua
new file mode 100755
index 0000000..f965bc6
--- /dev/null
+++ b/lua/4.lua
@@ -0,0 +1,38 @@
+N = 8
+
+function isPlaceOK(a,n,c)
+    for i = 1, n - 1 do
+        if (a[i] == c) or
+            (a[i] - n == c - n) or
+            (a[i] + n == c + n) then
+            return false;
+        end
+    end
+    return true;
+end
+
+function printSolution(a)
+    for i = 1, N do
+        for j = 1, N do
+            io.write(a[i] == j and "X" or "-", ' ');
+        end
+        io.write('\n');
+    end
+    io.write('\n');
+end
+
+function addQueen(a, n)
+    if n > N    then
+        printSolution(a);
+    else
+        for c = 1, N do
+            if isPlaceOK(a,n,c) then
+                a[n] = c;
+                addQueen(a, n + 1);
+            end
+        end
+    end
+end
+
+
+addQueen({},1)
diff --git a/lua/5.lua b/lua/5.lua
new file mode 100755
index 0000000..eeeb25c
--- /dev/null
+++ b/lua/5.lua
@@ -0,0 +1,7 @@
+local tolerance = 10;
+function isturnback(angle)
+    angle = angle % 360;
+    return (math.abs(angle - 180) < tolerance)
+end
+
+print(isturnback(-180))