When to line break when printing a one dimensional array as a multidimensional one?

[bergjensen33]

Let's say I have an array char arr[64] but I want to print it linearly, breaking lines when appropriate to get a 8x8 square.

a, b, c, d, e, f, g, h //newline
i, j, k, l, m, n [...]

I've tried:

bool shouldBreak(unsigned int x, unsigned int W)
{
    if((x + 1) % W == 0)
    {
        return true;
    }
    else
    {
        return false;
    }
}

But it does not behave as I'd expect. What's a good way to implement this?

[lastchance]

Use vector<string>

[bergjensen33]

lastchance, the char type is just an example. I'm trying to code a program that will show the slices of a 256*256*256 cube, each vertex being a color given by its 3D coordinates. I just need to know when to go down to the next line, I don't want to use a 3d vertex array.
Thanks!

[seeplus]

Perhaps:

#include <iostream>
#include <numeric>

int main()
{
	char arr[64];

	std::iota(arr, arr + std::size(arr), '0');

	for (size_t e = 0; e < std::size(arr); ++e)
		std::cout << arr[e] << ((e + 1) % 8 ? ' ' : '\n');
}

0 1 2 3 4 5 6 7
8 9 : ; < = > ?
@ A B C D E F G
H I J K L M N O
P Q R S T U V W
X Y Z [ \ ] ^ _
` a b c d e f g
h i j k l m n o

[lastchance]

bergjensen33 wrote:

I'm trying to code a program that will show the slices of a 256*256*256 cube, each vertex being a color given by its 3D coordinates.

If you want to be able to slice in ANY direction and use a flattened 1-d container then consider a std::valarray. It has native slicing built-in - the only one of the standard C++ containers to do so. Alternatively, you could write your own slicer for any of the other containers or simple arrays.

[bergjensen33]

Thank you both.

[williamhenrick]

why it's printing till 'o' why not up to 'z'? https://www.theengineeringprojects.com/2018/03/introduction-to-microcontrollers.html

[deleted account xyzzy]

Look at the size of the declared char array, a maximum of 64 characters can be stored. 64 characters that include the numeric digits and several non-alphanumeric characters.

10 numeric characters displayed, 7 non-alphanumeric chars, 26 capitalized alphabetic chars, 6 non-alphanumeric chars. That leaves space for only 15 lower-case chars.

If you wanted to print all the way to 'z' declare the char array to have space for 75 elements.

'x', 'y' and 'z' will be lonely orphans on the last line.