Cprogram_without_main.txt

Yes it is possible to run a C/C++ program without the main()

There are many methods.I know quiet few of them.

Here goes the code for that :

1)Using Macros

#include<stdio.h>  
#define fun main  
int fun(void)  
{  
 printf("Hello World");  
 return 0;  
} 
2)using augumented macro

#include<stdio.h>  
#define begin(m,a,i,n) m##a##i##n  
#define start begin(m,a,i,n)  
void start() {  
 printf("HelloWorld");  
} 
3)Modify the entry point during compilation

#include<stdio.h>  
#include<stdlib.h>  
// entry point function  
int nomain();   
void _start(){  
 // calling entry point  
 nomain();   
 exit(0);  
}  
int nomain()  
{  
 puts("HelloWorld");  
 return 0;  
}  
4)Using _start()

#include <stdlib.h> 
void _start() { 
 int ret = my_main(); 
  exit(ret);  
} 
int my_main() { 
 puts("This is a program without a main() function!"); 
  return 0;  
}

There are many more methods of doing this.

Hope you find this useful.