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So as to not overwhelm the reader with syntax that is unseen up to this point, use the original demonstration, but add an explanatory note hinting that there is more to the semantics of string literals than shown.
53 lines
1.7 KiB
Zig
53 lines
1.7 KiB
Zig
//
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// Now that we've learned about arrays, we can talk about strings.
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//
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// We've already seen Zig string literals: "Hello world.\n"
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//
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// Zig stores strings as arrays of bytes.
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//
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// const foo = "Hello";
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//
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// Is almost* the same as:
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//
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// const foo = [_]u8{ 'H', 'e', 'l', 'l', 'o' };
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//
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// (* We'll see what Zig strings REALLY are in Exercise 77.)
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//
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// Notice how individual characters use single quotes ('H') and
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// strings use double quotes ("H"). These are not interchangeable!
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//
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const std = @import("std");
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pub fn main() void {
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const ziggy = "stardust";
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// (Problem 1)
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// Use array square bracket syntax to get the letter 'd' from
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// the string "stardust" above.
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const d: u8 = ziggy[???];
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// (Problem 2)
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// Use the array repeat '**' operator to make "ha ha ha ".
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const laugh = "ha " ???;
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// (Problem 3)
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// Use the array concatenation '++' operator to make "Major Tom".
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// (You'll need to add a space as well!)
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const major = "Major";
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const tom = "Tom";
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const major_tom = major ??? tom;
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// That's all the problems. Let's see our results:
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std.debug.print("d={u} {s}{s}\n", .{ d, laugh, major_tom });
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// Keen eyes will notice that we've put 'u' and 's' inside the '{}'
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// placeholders in the format string above. This tells the
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// print() function to format the values as a UTF-8 character and
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// UTF-8 strings respectively. If we didn't do this, we'd see '100',
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// which is the decimal number corresponding with the 'd' character
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// in UTF-8. (And an error in the case of the strings.)
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//
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// While we're on this subject, 'c' (ASCII encoded character)
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// would work in place for 'u' because the first 128 characters
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// of UTF-8 are the same as ASCII!
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//
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}
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