From 0956f1839fcaaa273353148da9e157a8f9690d2f Mon Sep 17 00:00:00 2001 From: Dave Gauer Date: Fri, 12 Mar 2021 18:59:46 -0500 Subject: "999 is enough for anybody" triple-zero padding (#18) When I hit 999 exercises, I will finally have reached the ultimate state of soteriological release and no more exercises will be needed. The cycle will be complete. All that will be left is perfect quietude, freedom, and highest happiness. --- exercises/042_pointers4.zig | 32 ++++++++++++++++++++++++++++++++ 1 file changed, 32 insertions(+) create mode 100644 exercises/042_pointers4.zig (limited to 'exercises/042_pointers4.zig') diff --git a/exercises/042_pointers4.zig b/exercises/042_pointers4.zig new file mode 100644 index 0000000..261dbc1 --- /dev/null +++ b/exercises/042_pointers4.zig @@ -0,0 +1,32 @@ +// +// Now let's use pointers to do something we haven't been +// able to do before: pass a value by reference to a function! +// +const std = @import("std"); + +pub fn main() void { + var num: u8 = 1; + var more_nums = [_]u8{ 1, 1, 1, 1 }; + + // Let's pass a reference to num to our function and print it: + makeFive(&num); + std.debug.print("num: {}, ", .{num}); + + // Now something interesting. Let's pass a reference to a + // specific array value: + makeFive(&more_nums[2]); + + // And print the array: + std.debug.print("more_nums: ", .{}); + for (more_nums) |n| { + std.debug.print("{} ", .{n}); + } + + std.debug.print("\n", .{}); +} + +// This function should take a reference to a u8 value and set it +// to 5. +fn makeFive(x: *u8) void { + ??? = 5; // fix me! +} -- cgit v1.2.3-70-g09d2