how to write a program without main function in c code example

Example 1: can we write a program without main in c

#include<stdio.h>  
#define start main  
void start() 
{  
   printf("Hello, World!!!");  
}

Example 2: run program without main method using macro

#include<stdio.h>  
#define start main  
void start() 
{  
   printf("Hello, World!!!");  
}