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Diffstat (limited to 'exercises/032_unreachable.zig')
-rw-r--r-- | exercises/032_unreachable.zig | 44 |
1 files changed, 44 insertions, 0 deletions
diff --git a/exercises/032_unreachable.zig b/exercises/032_unreachable.zig new file mode 100644 index 0000000..ffc35a4 --- /dev/null +++ b/exercises/032_unreachable.zig @@ -0,0 +1,44 @@ +// +// Zig has an "unreachable" statement. Use it when you want to tell the +// compiler that a branch of code should never be executed and that the +// mere act of reaching it is an error. +// +// if (true) { +// ... +// } else { +// unreachable; +// } +// +// Here we've made a little virtual machine that performs mathematical +// operations on a single numeric value. It looks great but there's one +// little problem: the switch statement doesn't cover every possible +// value of a u8 number! +// +// WE know there are only three operations but Zig doesn't. Use the +// unreachable statement to make the switch complete. Or ELSE. :-) +// +const std = @import("std"); + +pub fn main() void { + const operations = [_]u8{ 1, 1, 1, 3, 2, 2 }; + + var current_value: u32 = 0; + + for (operations) |op| { + switch (op) { + 1 => { + current_value += 1; + }, + 2 => { + current_value -= 1; + }, + 3 => { + current_value *= current_value; + }, + } + + std.debug.print("{} ", .{current_value}); + } + + std.debug.print("\n", .{}); +} |