#include<conio.h> // non standard libary function for clrscr() and getch()
for(i=0;i<=10;++i) // first loop
for(j=0;j<=i;++j) // second nested loop
I guess it is correct...
As you may know conio is a non standard h file so please use any alternate for clrscr() and getch()
iostream.h is also nonstandard. Just delete the ".h" at the end to use the correct, standard iostream header file.
Also, I'm not sure why you would need to clear the screen before doing anything. Otherwise, your code is fine.