there is no difference between main() in both of the
languages...... in c++ we will see all intrerms of
objects.... thats all......

Ther is a difference b/w c and c++ main()...After execution 
of int main() in c it returns zero on null to the operating 
system where as in c++ it returns 1 to the O.S.

Ex: 
    In c:
     int main(){         void main(){
         .....            .......
         .....       OR   ......
         return 0;         }
    }  
In C++:

int main(){         int main(){
         .....            .......
         .....       OR   ......
         return 1;         }//by default it retruns 1.
    }

In c:
     int main(){         void main(){
         .....            .......
         .....       OR   ......
         return 0;         }
    }

in c & c++
the main difference is that "c" is based on top to bottom 
approach.in "c"languge the header file is used as 
#include<stdio.h> its also programable language.

& in c++ is based on bottom upto top approach. in c++ the 
header file is used as #include<iostream.h> is used. is 
also based on "object oriented program".

there is no difference b/w in c & c++ in main() function.

In C language , main() does not return any value.
Hence there is no need of return type whereas in c++ main 
returns the value. if there is no return type we should 
specify it by writing the keyword void before main.