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Asked: 2026-06-08T02:10:33+00:00

I have two arrays in C++ and I’d like to append one to the

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I have two arrays in C++ and I’d like to append one to the end of the other such that:

char byte1[] = {0x00};
char byte2[] = {0x01};

Appending these two should yield {0x00, 0x01}. How would I do this? It’s simple enough in Java using System.arraycopy(), but I’m not sure what library would help me to accomplish this in C++ / C as I’m coding for a microcontroller.

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1 Answer

  1. Editorial Team

    If you’re using C, you can do:

    //Whatever sizes your stating arrays are.
const int S_ARR1 = 3;
const int S_ARR2 = 2;

//Create buffer that can hold both.
char combined[S_ARR1 + S_arr2];

//Copy arrays in individually.
memcpy(combined, byte1, S_ARR1);
memcpy(combined + S_ARR1, byte2, S_ARR2);

    If you want C++, don’t use the byte arrays in the first place. Use std::vector as it acts as an array that can track its own number of elements so you can feel more like you’re in the java world 🙂

    A little warning though about C++ Vector Memory for Embedded:

    You’re in a micro-controller, std::vector can waste alot of memory as it grows based on a multiple of current size. The more that’s in it, the more you could be wasting. Having said that, it’s a great class and as long as you know how it handles its memory its a great option.

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