Added Exs. 6,7 strings

This commit is contained in:
Dave Gauer 2021-01-05 19:26:02 -05:00
parent faa49abb06
commit 30ef32e238
4 changed files with 67 additions and 0 deletions

40
06_strings.zig Normal file
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@ -0,0 +1,40 @@
//
// Now that we've learned about arrays, we can talk about strings.
//
// We've already seen Zig string literals: "Hello world.\n"
//
// Like the C language, Zig stores strings as arrays of bytes
// encoded as UTF-8 characters terminated with a null value.
// For now, just focus on the fact that strings are arrays of
// characters!
//
const std = @import("std");
pub fn main() void {
const ziggy = "stardust";
// Use array square bracket syntax to get the letter 'd' from
// the string "stardust" above.
const d: u8 = ziggy[???];
// Use the array repeat '**' operator to make "ha ha ha".
const laugh = "ha " ???;
// Use the array concatenation '++' operator to make "Major Tom".
// (You'll need to add a space as well!)
const major = "Major";
const tom = "Tom";
const major_tom = major ??? tom;
std.debug.print("d={u} {}{}\n",.{d, laugh, major_tom});
// Going deeper:
// Keen eyes will notice that we've put a 'u' inside the '{}'
// placeholder in the format string above. This tells the
// print() function (which uses std.fmt.format() function) to
// print out a UTF-8 character. Otherwise we'd see '100', which
// is the decimal number corresponding with the 'd' character
// in UTF-8.
// While we're on this subject, 'c' (ASCII encoded character)
// would work in place for 'u' because the first 128 characters
// of UTF-8 are the same as ASCII!
}

24
07_strings2.zig Normal file
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//
// Here's a fun one: Zig has multi-line strings!
//
// To make a multi-line string, put '\\' at the beginning of each
// line just like a code comment but with backslashes instead:
//
// const two_lines =
// \\Line One
// \\Line Two
// ;
//
// See if you can make this program print some song lyrics.
//
const std = @import("std");
pub fn main() void {
const lyrics =
Ziggy played guitar
Jamming good with Andrew Kelley
And the Spiders from Mars
;
std.debug.print("{}\n",.{lyrics});
}

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@ -61,6 +61,7 @@ Planned exercises:
* [x] Importing standard library
* [x] Assignment
* [x] Arrays
* [x] Strings
* [ ] If
* [ ] While
* [ ] For

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@ -70,6 +70,8 @@ check_it 02_std.zig "Standard Library"
check_it 03_assignment.zig "55 314159 -11" "There are three mistakes in this one!"
check_it 04_arrays.zig "Fourth: 7, Length: 8" "There are two things to complete here."
check_it 05_arrays2.zig "LEET: 1337, Bits: 100110011001" "Fill in the two arrays."
check_it 06_strings.zig "d=d ha ha ha Major Tom" "Each '???' needs something filled in."
check_it 07_strings2.zig "Ziggy" "Please fix the lyrics!"
echo
echo " __ __ _ "