Please help me in C++ simple program

[2kaud]

You are not using ansi c++ which is now the standard. You are using a version of c++ from prior to about 1998 before the ansi c++ standard was formalised. This code

#include<iostream.h>
int main()
{
    cout<<"sonia";
    return 0;
}

is not ansi c++ and would not compile using current compilers. I would strongly suggest you change your compiler to a more up-to-date one that conforms to ansi c++ standard. The current version is c++11. You are likely to come across these compatibility issues again using dev c++.

What os are you using? For Windows I would suggest Visual c++ express which is free.

From where are you learning c++? I would suggest you have a look at
http://www.learncpp.com/
http://www.cplusplus.com/doc/tutorial/
http://www.tutorialspoint.com/cplusplus/index.htm