Moved exercises to exercises because exercises

exercises/19_functions2.zig

@@ -0,0 +1,31 @@
+//
+// Now let's create a function that takes a parameter. Here's an
+// example that takes two parameters. As you can see, parameters
+// are declared just like an other types ("name": "type"):
+//
+//     fn myFunction( number: u8, is_lucky: bool ) {
+//         ...
+//     }
+//
+const std = @import( "std" );
+
+pub fn main() void {
+    std.debug.print("Powers of two: {} {} {} {}\n", .{
+        twoToThe(1),
+        twoToThe(2),
+        twoToThe(3),
+        twoToThe(4),
+    });
+}
+
+//
+// Please give this function the correct input parameter(s).
+// You'll need to figure out the parameter name and type that we're
+// expecting. The output type has already been specified for you.
+//
+fn twoToThe(???) u32 {
+    return std.math.pow(u32, 2, my_number);
+    // std.math.pow(type, a, b) takes a numeric type and two numbers
+    // of that type and returns "a to the power of b" as that same
+    // numeric type.
+}