How do I add values in an array using a loop without declaring the array size?

Question

Array and loops

Answer 1

You can have the user input the array size.

int array_size;
cin >> array_size;

int array[array_size];

for (int i = 0; i < array_size; i++)
{
array[i] = 0;
}

// array filled with zeros

Answer 2

either use dynamic array and continously allocate new space, or use a linked list..... or just use vectors, much simpler and not messy :)

https://www.tutorialspoint.com/cplusplus/cpp_stl_tutorial.htm

Answer 3

How about making a blank array.

One where you do not declare the size, and add as many values as you want.

Answer 4

Why not using vector. It is works as array also it is dynamic, you can add or pop element dynamically.

Answer 5

Do note that vectors may relocate from their original place in the memory.
That only means that if you keep a reference or pointer to a member in the vector and push something into it it MAY invalidate the pointer/reference. That is, they may point to unallocated space.

Just a sidenote:)