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#include<stdio.h>
#include<stdlib.h>
 
int n;
int *list;
int * MergeSort(int *A, int x, int y);
 
 
void main()
{
	printf("Enter the no. of integers in the array: ");
	scanf("%d",&n);
 
	list=(int *)malloc(n*sizeof(int));
 
	for(int i=0;i<n;i++)
	{	
		printf("\nEnter a no.: ");
		scanf("%d",&list[i]);
	}
 
	MergeSort(list,0,n-1);
 
	for(int i=0;i<n;i++)
	{	
		printf("%d ",list[i]);
	}
 
}
 
int * MergeSort(int *A, int x, int y)
{
	if(x==y)
	{
		return A;
	}
 
	else
	{
		int size=1+y-x;
		int half=size/2;
 
		MergeSort(A, 0, half-1);	
		MergeSort(A, half, y);	
 
 
		int *C;
		C=(int *)malloc(size*sizeof(int));
		int j=0;
		int k=half;
		int i=0;
 
 
		while((j<half)||(k<size))			
		{
			if(A[j]<=A[k])
			{
				C[i]=A[j];
				j++;
			}
			else
			{
				C[i]=A[k];
				k++;
			}
			i++;
		}
 
 
		if(j==half)
		{
			while(i<size)
			{
				C[i]=A[k];
				i++;
				k++;
			}
		}
		else if(k==size)
		{
			while(i<size)
			{
				C[i]=A[j];
				i++;
				j++;
			}
		}
 
 
 
		return C;
	}
 
}

prog.c:9:6: warning: return type of ‘main’ is not ‘int’ [-Wmain]
 void main()
      ^
prog.c: In function ‘main’:
prog.c:16:2: error: ‘for’ loop initial declarations are only allowed in C99 mode
  for(int i=0;i<n;i++)
  ^
prog.c:16:2: note: use option -std=c99 or -std=gnu99 to compile your code
prog.c:24:10: error: redefinition of ‘i’
  for(int i=0;i<n;i++)
          ^
prog.c:16:10: note: previous definition of ‘i’ was here
  for(int i=0;i<n;i++)
          ^
prog.c:24:2: error: ‘for’ loop initial declarations are only allowed in C99 mode
  for(int i=0;i<n;i++)
  ^

Standard output is empty