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Diffstat (limited to 'exercises/039_pointers.zig')
-rw-r--r-- | exercises/039_pointers.zig | 36 |
1 files changed, 36 insertions, 0 deletions
diff --git a/exercises/039_pointers.zig b/exercises/039_pointers.zig new file mode 100644 index 0000000..d545525 --- /dev/null +++ b/exercises/039_pointers.zig @@ -0,0 +1,36 @@ +// +// Check this out: +// +// var foo: u8 = 5; // foo is 5 +// var bar: *u8 = &foo; // bar is a pointer +// +// What is a pointer? It's a reference to a value. In this example +// bar is a reference to the memory space that currently contains the +// value 5. +// +// A cheatsheet given the above declarations: +// +// u8 the type of a u8 value +// foo the value 5 +// *u8 the type of a pointer to a u8 value +// &foo a reference to foo +// bar a pointer to the value at foo +// bar.* the value 5 (the dereferenced value "at" bar) +// +// We'll see why pointers are useful in a moment. For now, see if you +// can make this example work! +// +const std = @import("std"); + +pub fn main() void { + var num1: u8 = 5; + var num1_pointer: *u8 = &num1; + + var num2: u8 = undefined; + + // Please make num2 equal 5 using num1_pointer! + // (See the "cheatsheet" above for ideas.) + num2 = ???; + + std.debug.print("num1: {}, num2: {}\n", .{ num1, num2 }); +} |