C PROGRAM

Write a  C program using a  function without argument and  return type

#include <stdio.h>

#include<conio.h>
void greatnum();
void main()
{
  greatnum();
  return 0;
  }
  void greatnum()
  {
  int a,b;
  clrscr();
  printf("enter the two numbers of a and b \n");
  scanf("%d%d",&a,&b);
  if(a>b)
  printf("the greatest number is %d",a);
  else
 printf ("the greatest number is %d",b);
 getch();
 }

OUTPUT :

enter the two numbers of a and b 
10
20
the greatest number is 20
Process finished.