how can I use object in switch case

Ex: class invoice { private: int rate,qty,amt; public: void in(); { cout<<"Enter rate and qty: "; cin>>rate>>qty; } void out(); { amt=rate*qty; cout<<endl<<rate<<qty<<amt; } }; void main() { class invoice b; int ch; clrscr(); cout<<"Enter any Choice: "; cin>>ch; switch(ch) { case 1: b.in(); break; case 2:b.out(); break; } getch(); } When run this program then enter your choice, if I enter 1 then input rate and qty, if I enter 2 then display rate,qty, and amt which i input.

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