good pm..

how to load a new window,? what i mean is after i input the following choices A,B,C,D THE window or the A example will show what have in A.. and the previous txt that show in Program will to terminate.. take a look my code Ex:

#include<stdio.h>
#include<conio.h>
main()
{
char choice;
char ao;
clrscr();
gotoxy(30,3);printf("[.....MENU.....]");
gotoxy(20,6);printf("[A]");
gotoxy(25,7);printf("[45 per/kilo] *** Apple");
gotoxy(25,8);printf("[15 per/kilo] *** Orange");

gotoxy(20,11);printf("[B]");
gotoxy(25,12);printf("[12 per/kilo] *** Water Milon");
gotoxy(25,13);printf("[70 per/kilo] *** Mangustin");

gotoxy(20,16);printf("[C]");
gotoxy(25,17);printf("[200 per/kilo] *** Lemon");
gotoxy(25,18);printf("[50 per/kilo] *** Mandarin");

gotoxy(20,21);printf("[D]");
gotoxy(25,22);printf("[55 per/kilo] *** Durian");
gotoxy(25,23);printf("[30 per/kilo] *** Custard Apple");

choice=getche();
switch(choice) {
clrscr();
case 'a': printf("i want to show this text Only when i choice A? ");
break;
case 'b': printf("nothing");
break;
}
getch();
}

pls help me!!