1 files changed, 28 insertions, 0 deletions
diff --git a/19_functions2.zig b/19_functions2.zig
new file mode 100644
index 0000000..68cc67b
--- /dev/null
+++ b/19_functions2.zig
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+//
+// Now let's use a function that takes a parameter.
+//
+const std = @import( "std" );
+
+pub fn main() void {
+    std.debug.print("Powers of two: {} {} {} {}\n", .{
+        twoToThe(1),
+        twoToThe(2),
+        twoToThe(3),
+        twoToThe(4),
+    });
+}
+
+//
+// Oops! We seem to have forgotten something here. Function
+// parameters look like this:
+//
+//   fn myFunction( number: u8, is_lucky: bool ) {
+//       ...
+//   }
+//
+// As you can see, we declare the type of the parameter, just
+// like we declare the types of variables, with a colon ":".
+//
+fn twoToThe(???) u32 {
+    return std.math.pow(u32, 2, my_number);
+}