Merge Sort Algorithm with C source Codes

Here, I've presented the merge sort algorithm as the straight merge sort. The basic idea is to break the file into n subfiles of size 1 and merge adjacent disjoint pairs of files and repeating the process until we've single file remaining of size n.
 The C Source codes is as follows:

// Merge sort implementation in C

#include<stdio.h>

void getdata(int arr[],int n)
{
 int i;
  printf("\nEnter the data:");
  for(i=0;i<n;i++)
    {
     scanf("%d",&arr[i]);
    }
}