From 55ad7c32f2d534b1fbd438204d21738f958c51a5 Mon Sep 17 00:00:00 2001 From: Dave Gauer Date: Tue, 9 Feb 2021 18:36:57 -0500 Subject: Moved exercises to exercises because exercises --- 41_pointers3.zig | 41 ----------------------------------------- 1 file changed, 41 deletions(-) delete mode 100644 41_pointers3.zig (limited to '41_pointers3.zig') diff --git a/41_pointers3.zig b/41_pointers3.zig deleted file mode 100644 index 21a43bd..0000000 --- a/41_pointers3.zig +++ /dev/null @@ -1,41 +0,0 @@ -// -// The tricky part is that the pointer's mutability (var vs const) refers -// to the ability to change what the pointer POINTS TO, not the ability -// to change the VALUE at that location! -// -// const locked: u8 = 5; -// var unlocked: u8 = 10; -// -// const p1: *const u8 = &locked; -// var p2: *const u8 = &locked; -// -// Both p1 and p2 point to constant values which cannot change. However, -// p2 can be changed to point to something else and p1 cannot! -// -// const p3: *u8 = &unlocked; -// var p4: *u8 = &unlocked; -// const p5: *const u8 = &unlocked; -// var p6: *const u8 = &unlocked; -// -// Here p3 and p4 can both be used to change the value they point to but -// p3 cannot point at anything else. -// What's interesting is that p5 and p6 act like p1 and p2, but point to -// the value at "unlocked". This is what we mean when we say that we can -// make a constant reference to any value! -// -const std = @import("std"); - -pub fn main() void { - var foo: u8 = 5; - var bar: u8 = 10; - - // Please define pointer "p" so that it can point to EITHER foo or - // bar AND change the value it points to! - ??? p: ??? = undefined; - - p = &foo; - p.* += 1; - p = &bar; - p.* += 1; - std.debug.print("foo={}, bar={}\n", .{foo, bar}); -} -- cgit v1.2.3-ZIG