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Oct 28th, 2007
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Not sure why [continue] is not working

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Shouldn't continue in my else statement return me to the top do...while loop and print the following again?

C++ Syntax (Toggle Plain Text)
  1. #include <iostream>
  2. #include <string>
  3. using namespace std;
  4.  
  5. int main()
  6. { 
  7.    double withdraw, deposit, balance, newBalance, amount;
  8.    char ans;
  9.    string choice;
  10.  
  11.    balance = 1000;
  12.  
  13.    cout << "Welcome to Whatever ATM!" << endl;
  14.  
  15.    do
  16.    {
  17.        cout << "\nWhat would you like to do from the following?\n"
  18.         << "\nWithdraw from account\n"
  19.         << "Deposit money into account\n"
  20.         << "Balance inquiry\n"
  21.         << "Quit\n"
  22.         << "\nPlease select now" << endl;
  23.  
  24.        cin >> choice;
  25.        ans = choice[0];
  26.        newBalance = balance;
  27.  
  28.        if ((ans == 'w') || (ans == 'W'))
  29.        {
  30.            cout << "\nWhat amount would you like to withdraw?" << endl;
  31.            cin >> amount;
  32.  
  33.                while (amount > balance)
  34.                {
  35.                    cout << "Sorry, you have insufficient funds.\n"
  36.                    << "Please try again:  ";
  37.                    cin >> amount;
  38.                }
  39.                if (amount <= balance)
  40.                {
  41.                    balance = balance - amount;
  42.                    newBalance = balance;
  43.                    cout << "Thank you, your new balance is: " << newBalance << endl;
  44.                }
  45.        }
  46.  
  47.        else if ((ans == 'd') || (ans == 'D'))
  48.        {
  49.            cout << "\nWhat amount would you like to deposit?" << endl;
  50.            cin >> amount;
  51.            balance = balance + amount;
  52.            newBalance = balance;
  53.            cout << "Thank you, your new balance is: " << newBalance <<endl;
  54.        }
  55.        else if ((ans == 'b') || (ans == 'B'))
  56.            cout << "Your balance is:  " << balance <<endl;
  57.        else if ((ans == 'y') || (ans =='Y'))
  58.        {
  59.            cout << "\nThank you for banking with Whatever ATM!" << endl;
  60.            return 0;
  61.        }
  62.        else
  63.        {
  64.            cout << "\nSorry, input not valid, please select again" << endl;
  65.            continue;
  66.        }
  67.  
  68.        cout << "\nWould you like to make another transaction? (Y/N)  ";
  69.        cin >> choice;
  70.        ans = choice[0];
  71.    }
  72.    while ((ans == 'y') || (ans =='Y'));
  73.  
  74.    cout << "\nThank you for banking with Whatever ATM!" << endl;
  75. }
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dabu is offline Offline
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Oct 28th, 2007
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Re: Not sure why [continue] is not working

I believe so.
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WaltP is offline Offline
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Re: Not sure why [continue] is not working

Well for some reason it doesn't, it just breaks the loop and I don't understand why.
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Re: Not sure why [continue] is not working

Part of my code i pasted was wrong, either way, it doesnt effect the whole thing
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Re: Not sure why [continue] is not working

Click to Expand / Collapse  Quote originally posted by dabu ...
Shouldn't continue in my else statement return me to the top do...while loop and print the following again?
Sorry, my mistake. No, the continue sends you to the bottom of the loop.
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Re: Not sure why [continue] is not working

Hmm, thats weird, my book tells me that it jumps back to the beginning of the loop. Well, if that doesn't work, how do I go about making the statement in my else to return to the top?
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Re: Not sure why [continue] is not working

First figure out why the loop exits. Then before the continue, defeat the exit condition.
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Re: Not sure why [continue] is not working

I slept on it and still cant figure it out. Should I have another loop before my if statement? If I do, I don't know what the condition would be. Also for one of the if statements (which i accidentally posted as,
C++ Syntax (Toggle Plain Text)
  1. else if ((ans == 'y') || (ans == 'Y'))
I would want it to quit the program, not just break the loop.
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Re: Not sure why [continue] is not working

Look at the do-while. What causes the loop to exit?
Then look at the if with the continue. Is there a correlation?
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Re: Not sure why [continue] is not working

Okay, I changed it, adding another
C++ Syntax (Toggle Plain Text)
  1. do-while
loop, but now the continue only goes through once. If the user enters an invalid answer, it does what I want it to, but when i enter another invalid answer, it breaks the loop. Is it something wrong with my condition?


C++ Syntax (Toggle Plain Text)
  1. #include <iostream>
  2. #include <string>
  3. using namespace std;
  4.  
  5. int main()
  6. { 
  7.    double withdraw, deposit, balance, newBalance, amount;
  8.    char ans;
  9.    string choice;
  10.  
  11.    balance = 1000;
  12.  
  13.    cout << "Welcome to Whatever ATM!" << endl;
  14.  
  15.    do
  16.    {
  17.  
  18.        do
  19.        {
  20.            cout << "\nWhat would you like to do from the following?\n"
  21.                 << "\nWithdraw from account\n"
  22.                 << "Deposit money into account\n"
  23.                 << "Balance inquiry\n"
  24.                 << "Quit\n"
  25.                 << "\nPlease select now" << endl;
  26.  
  27.            cin >> choice;
  28.            ans = choice[0];
  29.            newBalance = balance;
  30.  
  31.            if ((ans == 'w') || (ans == 'W'))
  32.            {
  33.                cout << "\nWhat amount would you like to withdraw?" << endl;
  34.                cin >> amount;
  35.  
  36.                while (amount > balance)
  37.                {
  38.                    cout << "Sorry, you have insufficient funds.\n"
  39.                    << "Please try again:  ";
  40.                    cin >> amount;
  41.                }
  42.                if (amount <= balance)
  43.                {
  44.                    balance = balance - amount;
  45.                    newBalance = balance;
  46.                    cout << "Thank you, your new balance is: " << newBalance << endl;
  47.                    break;
  48.                }
  49.            }
  50.            else if ((ans == 'd') || (ans == 'D'))
  51.            {
  52.                cout << "\nWhat amount would you like to deposit?" << endl;
  53.                cin >> amount;
  54.                balance = balance + amount;
  55.                newBalance = balance;
  56.                cout << "Thank you, your new balance is: " << newBalance <<endl;
  57.                break;
  58.            }
  59.            else if ((ans == 'b') || (ans == 'B'))
  60.            {        
  61.                cout << "Your balance is:  " << balance <<endl;
  62.                break;
  63.            }
  64.            else if ((ans == 'q') || (ans =='q'))
  65.                break;
  66.            else 
  67.            {  
  68.                cout << "\nSorry, input not valid, please select again" << endl;
  69.                cout << "\nWhat would you like to do from the following?\n"
  70.                     << "\nWithdraw from account\n"
  71.                     << "Deposit money into account\n"
  72.                     << "Balance inquiry\n"
  73.                     << "Quit\n"
  74.                     << "\nPlease select now" << endl;
  75.  
  76.                cin >> choice;
  77.                ans = choice[0];
  78.                continue;
  79.            }
  80.        }
  81.        while ((ans == 'w') || (ans == 'W') || (ans == 'd') || (ans == 'D')
  82.            || (ans == 'b') || (ans == 'B') || (ans == 'q') || (ans == 'Q'));
  83.        cout << "\nWould you like to make another transaction? (Y/N)  ";
  84.        cin >> choice;
  85.        ans = choice[0];
  86.    }
  87.    while ((ans == 'y') || (ans =='Y'));
  88.  
  89.    cout << "\nThank you for banking with Whatever ATM!" << endl;
  90. }
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