implementing calls and functions (ch24)

samples/ch24_function.lox

@@ -0,0 +1,4 @@
+fun areWeHavingItYet() {
+    print "Yes we are!";
+}
+print areWeHavingItYet;

samples/ch24_function_call.lox

@@ -0,0 +1,9 @@
+fun helloWorld(var_str, var_int) {
+    var b = 1;
+    print var_str + " blah";
+
+    return b + var_int;
+}
+
+var c = helloWorld("a", 42);
+print c;

samples/ch24_invalid_arg_count.lox

@@ -0,0 +1,7 @@
+fun a() { b(); }
+fun b() { c(); }
+fun c() {
+    c("too", "many");
+}
+
+a();

samples/ch24_multiple_calls.lox

@@ -0,0 +1,3 @@
+fun a(a, b) { var c = a + b; return c; }
+print a(2, 4);
+print a(4, 6);