mention builtin ex coming up

This commit is contained in:
Dave Gauer 2021-04-10 14:45:25 -04:00
parent cc269968ea
commit 0f28e58eea
3 changed files with 10 additions and 2 deletions

View file

@ -25,6 +25,9 @@ pub fn main() void {
//
// See if you can figure out the missing piece:
for (bits) |bit, ???| {
// Note that we convert the usize i to a u32 with
// @intCast(), a builtin function just like @import().
// We'll learn about these properly in a later exercise.
var place_value = std.math.pow(u32, 2, @intCast(u32, i));
value += place_value * bit;
}

View file

@ -5,7 +5,9 @@
//
// const Stuff = enum(u8){ foo = 16 };
//
// You can get the integer out with a built-in function:
// You can get the integer out with a builtin function,
// @enumToInt(). We'll learn about builtins properly in a later
// exercise.
//
// var my_stuff: u8 = @enumToInt(Stuff.foo);
//

View file

@ -419,7 +419,10 @@ pub fn main() void {
// we need to loop through the items in reverse, skipping nulls, until
// we reach the destination at the front of the array.
fn printTrip(trip: []?TripItem) void {
var i: u8 = @intCast(u8, trip.len); // convert usize length
// We convert the usize length to a u8 with @intCast(), a
// builtin function just like @import(). We'll learn about
// these properly in a later exercise.
var i: u8 = @intCast(u8, trip.len);
while (i > 0) {
i -= 1;