Switch statements with while loops - c++

Question

do{
cout << "Select an option from the Menu: ";
cin >> choice;
// Validate the menu selection
while ((choice < 1) || (choice > 3)){
cout << "Incorrect input!, please enter an option from 1 to 3."<<endl;
cout<<"Enter your choice: ";
cin >> choice;
}
// Processing the users choice
if (choice != 3){
// Compute conversions
switch (choice){
case 1:
cout<<""<<endl;
cout<<"You have selected to convert Fijian Dollars to Vanuatuan Vatu."<<endl;
cout<<"Enter the amount you wish to convert: ";
cin >> amount;
conversion = amount * FJD_to_Vatu_Rate;
break;
case 2:
cout<<""<<endl;
cout<<"You have selected to convert Fijian Dollars to Samoan Tala."<<endl;
cout<<"Enter the amount you wish to convert: ";
cin >> amount;
conversion = amount * FJD_to_Tala_Rate;
break;
case 3:
cout<<"Here the history will be shown"<<endl;
cout<<""<<endl;
cout<<"Do You want to perform another conversion? (Y/N) ";
cin >> repeat;
if (repeat == 'Y'){
(This is what i want to know)
}
cout<<"Thank you for using this program, goodbye!"<<endl;
return 0;
}
// Display the monthly charges
cout << fixed << showpoint << setprecision(2);
cout << "The converted amount is: " << conversion << endl;
cout <<""<<endl;
}
} while (choice != 3);
cout<<"Thank you for using this program, goodbye!"<<endl;
return 0;
}
The above is my part of my code for a currency converter, can anyone tell me if what to do in the section where it says "this is what i want to know" so that the program asks user to enter a choice so it can process it and use the choice to compute using one of the other cases.
Thanks

Answer 1

Remove your if statement before switch because case 3: will never be executed in this case.
do{
cout << "Select an option from the Menu: ";
cin >> choice;
// Validate the menu selection
while ((choice < 1) || (choice > 3)){
cout << "Incorrect input!, please enter an option from 1 to 3."<<endl;
cout<<"Enter your choice: ";
cin >> choice;
}
// Processing the users choice
// Compute conversions
switch (choice){
case 1:
cout<<""<<endl;
cout<<"You have selected to convert Fijian Dollars to Vanuatuan Vatu."<<endl;
cout<<"Enter the amount you wish to convert: ";
cin >> amount;
conversion = amount * FJD_to_Vatu_Rate;
break;
case 2:
cout<<""<<endl;
cout<<"You have selected to convert Fijian Dollars to Samoan Tala."<<endl;
cout<<"Enter the amount you wish to convert: ";
cin >> amount;
conversion = amount * FJD_to_Tala_Rate;
break;
case 3:
cout<<"Here the history will be shown"<<endl;
cout<<""<<endl;
cout<<"Do You want to perform another conversion? (Y/N) ";
cin >> repeat;
if (repeat == 'Y'){
(This is what i want to know)
}
cout<<"Thank you for using this program, goodbye!"<<endl;
return 0;
// Display the monthly charges
cout << fixed << showpoint << setprecision(2);
cout << "The converted amount is: " << conversion << endl;
cout <<""<<endl;
}
} while (choice != 3);
cout<<"Thank you for using this program, goodbye!"<<endl;
return 0;
}

Answer 2

To restart do-while loop use continue. Logically you should print history first first, then do question\check.