How to replace an element in an array in C++

This is a simple C++ Program to replace an element in an array.
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[sherrygamingzone]

thanks, bro it saved me a 10 point quiz.

[tasnimjerin]

it was really helpful .thank you so much.
can you make a video where we can replace an element of an array with 0 when we have negtive values?

[sarahhold]

EDIT: It works now, if I use this int arr[5]; (or with any other numbers) instead of int arr[n];

I have an error for this line int arr[n];
It says "expression did not evaluate to a constant"

How can I solve this? Any idea? The code doesn' t work for me due to this error.