Merge Sort Program in C in C

/* 
Merge Sort, Written in C, 
Author: Juneja Afzal, T.E, computer engg
*/

#include<stdio.h>
#include<stdlib.h>
#include<conio.h>
main()
{
                          int a[50],n,low,high,mid,i;
                          void mergesort(int a[50] ,int ,int);
//                          void combine(int,int ,int);
                          void display(int a[50],int);
                          printf("\nENter the number of element for arrra===");
                          scanf("%d",&n);
                          printf("\n*******Enter the Elements****\n");
                          for(i=0;i<=n-1;i++)
                          {
                                                              printf("\nENter the element number %d=== ",i+1);
                                                              scanf("%d",&a[i]);
                             }
                             
                             low=0;
                             high=n-1;
                             //
                             mergesort(a,low,high);
                             display(a,n);
}

void mergesort(int a[], int low, int high)
{
          int mid;
          void combine(int a[], int, int, int);
          if(low<high)
          {
                            mid=(low+high)/2;
                            mergesort(a,low,mid);
                            mergesort(a,mid+1,high);
                            combine(a,low,mid,high);
                            }
}

void combine(int a[], int low, int mid, int high)
{
          int i,j,k,temp[50];
          i=low;
          k=low;
          j=mid+1;
          
          while(i<=mid && j<=high)
          {
                                     if(a[i]<=a[j])
                                     {
                                                                 temp[k]=a[i];
                                                                 i++;
                                                                 k++;
                                        }
                                        else
                                        {
                                                 temp[k]=a[j];
                                                 j++;
                                                 k++;
                                        }
                }
                
                while(i<=mid)
                {
                                          
                                          temp[k]=a[i];
                                                                 i++;
                                                                 k++;
                }
                
                while(j<=high)
                {
                     
                                                 temp[k]=a[j];
                                                 j++;
                                                 k++;
                        }
                                        
                                        for(k=low;k<=high;k++)
                                        {
                                                                                     a[k]=temp[k];
                                        }
                                          
                                                    
            }


void display(int a[],int n)
{
          int i=0;
          printf("\n*********THE SORTED LIST IS USING MERGE SORT*********\n");
          for(i=0;i<=n-1;i++)
          {
                                                 printf("\n \t %d",a[i]);
                }
}