5 files changed, 83 insertions, 20 deletions
diff --git a/examples/10.src b/examples/10.src
index 0ec38ea..59f91e1 100644
--- a/examples/10.src
+++ b/examples/10.src
@@ -1,14 +1,16 @@
 let main = () => i64 {
 	let counter = 0;
 
-	while !(counter == 10) {
+	while counter < 10 {
 		print(counter);
 		counter = counter + 1;
 	};
 
-	while counter == 0 {
-		print(0);
+	while true {
+		if counter == 10 {
+			return counter;
+		};
 	};
 
-	return counter;
+	return 1;
 };
diff --git a/examples/12.src b/examples/12.src
index 1bff280..a680efa 100644
--- a/examples/12.src
+++ b/examples/12.src
@@ -1,8 +1,38 @@
-let print_int = (n: i64) => i64 {
-	print(n);
-	return n;
-};
+let main = () => i64 {
+    let factorial = (n: i64) => i64 {
+        let f = (acc: i64, n: i64) => i64 {
+            if n == 0 {
+                return acc;
+            };
+            return f(acc * n, n - 1);
+        };
+        return f(1, n);
+    };
+
+    let is_even = (n: i64) => bool {
+        if n % 2 == 0 {
+            return true;
+        };
+        return false;
+    };
+
+    let sum_if = (predicate: (i64) => bool, limit: i64) => i64 {
+        let sum = 0;
+        let i = 0;
+        while i < limit {
+            if predicate(i) {
+                sum = sum + i;
+            };
+            i = i + 1;
+        };
+        return sum;
+    };
+
+    let fact_val = factorial(6);
+    print(fact_val);
+
+    let even_sum = sum_if(is_even, 20);
+    print(even_sum);
 
-let main = (argc: i64) => i64 {
-	return print_int(argc);
+    return 0;
 };
diff --git a/examples/13.src b/examples/13.src
new file mode 100644
index 0000000..eeb5b32
--- /dev/null
+++ b/examples/13.src
@@ -0,0 +1,31 @@
+let main = () => i64 {
+    /* Iterative Fibonacci using while loop. */
+    let fibonacci_iter = (n: i64) => i64 {
+        let a = 0;
+        let b = 1;
+        let i = 0;
+        while i < n {
+            let temp = b;
+            b = a + b;
+            a = temp;
+            i = i + 1;
+        };
+        return a;
+    };
+
+    /* Recursive GCD using Euclid's algorithm. */
+    let gcd = (a: i64, b: i64) => i64 {
+        if b == 0 {
+            return a;
+        };
+        return gcd(b, a % b);
+    };
+
+    let fib_val = fibonacci_iter(10);
+    print(fib_val);
+
+    let gcd_val = gcd(48, 18);
+    print(gcd_val);
+
+    return 0;
+};
diff --git a/examples/7.src b/examples/7.src
index c0690b6..b10a350 100644
--- a/examples/7.src
+++ b/examples/7.src
@@ -2,7 +2,7 @@ let ten = () => i64 {
 	return () => i64 {
 		return 10;
 	}();
-}; /* TODO */
+};
 
 let main = () => i64 {
 	let i = 4;
diff --git a/examples/8.src b/examples/8.src
index 73ea7aa..985ca77 100644
--- a/examples/8.src
+++ b/examples/8.src
@@ -1,14 +1,14 @@
-let fib = (n: i64) => i64 {
-	if n == 0 {
-		return 0;
-	};
-	if n == 1 {
-		return 1;
+let main = () => i64 {
+	let fib = (n: i64) => i64 {
+		if n == 0 {
+			return 0;
+		};
+		if n == 1 {
+			return 1;
+		};
+		return fib(n-2) + fib(n-1);
 	};
-	return fib(n-2) + fib(n-1);
-};
 
-let main = () => i64 {
 	let result = fib(30);
 	print(result);
 	return result;