Problems with Looping

This is a discussion on Problems with Looping within the C++ Programming forums, part of the General Programming Boards category; I have a c++ problem regarding looping. I am writing a program which will include a problem similar to below. ...

  1. #1
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    Problems with Looping

    I have a c++ problem regarding looping. I am writing a program which will include a problem similar to below.

    1) ok, i am writing a program that asks the user to enter a number.

    2) Then ask the user if the number entered was correct.

    3) If the number is correct, the user will enter 'y' or 'yes' and the program will terminate.
    (pretty simple so far ?

    4) If the user enters 'n' or 'no' the program should loop back to the beginning of the program and start again. goes back to 1)

    5) However, if the user enters anything other than 'yes' or 'no', the program rejects this input and tells the user to re-enter, using only 'yes' or 'no'.

    6) This should be asked infinitely until either 'yes' or 'no' is inputted, after which the program then loops back to the beginning.
    how would i do this ?

    i've been trying do while and switch but no luck. would i have to use a for loop ?

    Thanks

  2. #2
    a_capitalist_story
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    If you've been trying to do this "for a while, " then you've got some code that shows that and some errors and/or problems you'd like to address. Let's see both/all of those.

  3. #3
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    Quote Originally Posted by rags_to_riches View Post
    If you've been trying to do this "for a while, " then you've got some code that shows that and some errors and/or problems you'd like to address. Let's see both/all of those.
    Code:
    #include <iostream.h>
    #include <string>
    #include <conio.h>
    
    main()
    {
    	string date;
       char answer; //either yes or no
       bool check;
    
    do	{
    		cout << "\nplease enter the date in dd/mm/yyyy: "; //beginning of loop********************************
          cin >> date;
    
          cout << "\nIs this the correct date ? press y/n \n" << date << "\n\n";
          cin >> answer;
    
          switch (answer) {
          	case 'y':
             	cout << "\nThank you!!\n";
                break;
    
          }while (answer != 'y');
       }  getch();
    }
    ok then, if u insist.
    here we go then.

  4. #4
    and the Hat of Guessing tabstop's Avatar
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    There isn't such a thing as a switch-while loop. Perhaps you want a switch inside of a loop.

  5. #5
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    Quote Originally Posted by tabstop View Post
    There isn't such a thing as a switch-while loop. Perhaps you want a switch inside of a loop.
    how would you go about writing what i am trying to do ?

  6. #6
    and the Hat of Guessing tabstop's Avatar
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    And now upon rereading I see that very lonely do up there at the top. So the loop appears to be fine -- the question now is: what do you want to do? Do you only want to give a message when they type 'y'? What if they type 'n'? What if they type 'q'? The requirements state you need yet another loop to handle the case of weird input.

  7. #7
    a_capitalist_story
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    There's no closing '}' on the switch block.

  8. #8
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    You could use a while loop and get rid of the switch, just use an if statement.

  9. #9
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    BTW my compiler does not like <iostream.h>

  10. #10
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    Code:
    #include <iostream.h>
    #include <string>
    #include <conio.h>
    
    main()
    {
    	string date;
       char answer; //either yes or no
       bool check;
    
    do	{  //beginning of loop********************************
    		cout << "\nplease enter the date in dd/mm/yyyy: ";
          cin >> date;
    
          cout << "\nIs this the correct date ? press y/n \n" << date << "\n\n";
          cin >> answer;
    
          switch (answer) {
          	case 'y':
             	cout << "\nThank you!!\n";
                break;
    
          }
    	}while (answer != 'y');
    }
    here is what i ended up with

  11. #11
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    i'm sure an if statement wouldnt loop though

  12. #12
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    The if would replace the switch. Inside the loop.

  13. #13
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    Does your program work now?

  14. #14
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    Quote Originally Posted by fadlan12 View Post
    Does your program work now?

    you mean,

    Code:
    #include <iostream.h>
    #include <string>
    #include <conio.h>
    
    main()
    {
    	string date;
       char answer; //either yes or no
       bool check;
    
    do	{  //beginning of loop********************************
    		cout << "\nplease enter the date in dd/mm/yyyy: ";
          cin >> date;
    
          cout << "\nIs this the correct date ? press y/n \n" << date << "\n\n";
          cin >> answer;
    
          if (answer = 'y')
          cout << "\nThank you!!\n";
          break;
    
    
    	}while (answer != 'y');
    }
    it wont loop with the if

  15. #15
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    Can you get it to compile without my suggestion? It won't compile for me at all with your code. I got it to work with a while loop and an if statement inside. But your code is missing a few things, for ex when you compile it says string, cin, cout etc not declared.

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