Error in Merge sort implementation

Question

The code give below is code of merge sort. When I run this program I get output array same as input array? I can't trace where is the problem? Can you trace it?
https://code.sololearn.com/c2ivmw06r92q/?ref=app

Answer 1

Your calculation of n gets 1 as 4/4=1. There isn't a way for C to know how many elements are in your array.