Question

I have an array, but I want to add something at the end without overwriting any of the data that is already present it it. It has to be an Array not a vector as it is an Assignment.

Answer 1

From the comments, it sounds like you don’t want to add to the end of an array, but rather to partially fill an array and keep track of how much data you’ve written. You just need a variable to keep track of that:

char array[10];
size_t size = 0;

// Add characters:
array[size++] = 'H';
array[size++] = 'e';
array[size++] = 'l';
array[size++] = 'l';
array[size++] = 'o';

You need to make sure that you never go beyond the end of the array, otherwise you will corrupt other memory.