Code:
#include <iostream.h>
int main()
{
 cout<<"Hello World!";
 return 0;
}
that code wont work in Dev-C++ because you have used iostream.h instead of iostream (no .h) you can also add cin.get(); just before return 0; that will wait for user input before quiting.
Code:
#include <iostream>
using namespace std;

int main()
{
   cout << "Hello world!" << endl;
   cin.get();
   return 0;
}
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