Exercises

This section closes the chapter. The exercises are small programs. Write them by hand. Compile them. Change them. Run them again.

Exercise 6-1. Declare an array of 10 integers and print the elements in order.

Exercise 6-2. Print the same array in reverse order.

Exercise 6-3. Write a function named zero5 that takes *[5]i32 and sets all five elements to zero.

Exercise 6-4. Copy one array to another. Change the second array. Print both arrays to show that the copy is separate.

Exercise 6-5. Declare this array with an inferred length:

const nums = [_]i32{ 1, 2, 3, 4, 5 };

Print its length.

Exercise 6-6. Create an array of 16 zero bytes using **.

Exercise 6-7. Create a 3 by 3 table of integers. Print the value in row 2, column 1.

Exercise 6-8. Write a function sum that takes []const i32 and returns the sum.

Exercise 6-9. Write a function fill that takes []i32 and an i32 value, and sets every element of the slice to that value.

Exercise 6-10. Create an array of 8 integers. Make a slice containing elements 2 through 5. Change the slice. Print the original array.

Exercise 6-11. Declare a sentinel array:

const word: [5:0]u8 = .{ 'h', 'e', 'l', 'l', 'o' };

Convert it to [:0]const u8 and print it with {s}.

Exercise 6-12. Print every byte of "zig" as a decimal number.

Exercise 6-13. Print every byte of "é" as a hexadecimal number.

Exercise 6-14. Use std.unicode.Utf8View to print the code points of "hé".

Exercise 6-15. Write a function countCodepoints that takes []const u8 and returns !usize.

Exercise 6-16. Explain, in one sentence, the difference between [N]T and []T.

Exercise 6-17. Explain, in one sentence, why s.len is not always the number of characters in a string.

Exercise 6-18. Write a program that accepts one string literal, prints its byte length, then prints its UTF-8 code point count.