main()
{
char a;
printf("Chose any of the following:\na) Question 1\tc) Question 3\nb) Question 2\td) Question 4\n\nEnter here:");
scanf("%c", &a);
switch(a)
{
case 'a':
system("cls");
question1();
break;
}
}
main(){
int ch;
printf("1. Thong tin chi tiet khach hang. ");
printf("\n2. Thong tin su dung dien thoai");
printf("\n3. Hoa don hang thang");
printf("\n4. Bao cao ca nam");
printf("\n5. Bao cao 3 thang cao nhat(bonus)");
printf("\n6. Thoat");
struct sudung p[12];
do{
printf("\nNhap vao su lua chon : ");
scanf("%d",&ch);
switch(ch){
case 1:
question1();
break;
case 2:
question2(p);
break;
case 3:
question3(p);
break;
case 6:
exit(0);
}
}while(1);
getch();
}
