URGENT!! using cprintf and cscanf, cout and cin in c++

Hi! My teacher said that when we use gotoxy, we cannot use cout anymore. she said that we should only use cprintf and cscanf. but when I used cin and cout, it worked! and also why is it that when i use cscanf, it stops working?

gotoxy(1,2); cprintf("How much did you pay?");


gotoxy(1,3); cprintf("Your change is %.2f",money);

but when I use cin, it works? also, how do I put 2 decimal places using cprintf?

gotoxy(1,2); cout<<"How much did you pay?";


gotoxy(1,3); cout<<"Your change is "<<money;

Thanks in advance!
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