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  • 1 Post By rags_to_riches
  • 2 Post By iMalc

how to make only letter r to restart?

This is a discussion on how to make only letter r to restart? within the C++ Programming forums, part of the General Programming Boards category; hi i want the program below to restart only when specific letter is entered from keyboard....at this point the program ...

  1. #1
    Registered User
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    Dec 2011
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    18

    how to make only letter r to restart?

    hi i want the program below to restart only when specific letter is entered from keyboard....at this point the program accept any letter to restart except 'q'.

    so how im gonna do it will only except letter 'r' to restart? thanks.


    [tag]
    Code:
    #include <iostream>
    #include <stdio.h>
    #include <stdlib.h>
    #include <string>
    
    
    using namespace std;
    
    int main (int argc, char *argv[])
    
    {
       char again, quit ;
       string name = "";
       while (quit != 'q')
            
            do{
                system ("cls");
                
                cout << "Hello, what is your name? \n";
                cin >> name;
     
                cout << "Hi " << name;
              
                
                cout << "\n Please press r to restart or q to quit and press enter";
                cin >> quit;
               
                  
            }               
                    
        
                   
            while(toupper(again) == 'r'); //restart program
    
    return 0;
    }
    [/tag]

  2. #2
    a_capitalist_story
    Join Date
    Dec 2007
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    2,650
    For starters, if you're going to use toupper, why would you compare the result to a lower-case letter? And wouldn't you compare the user's input, rather than an uninitialized variable?
    jimblumberg likes this.

  3. #3
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    sorry i didnt get what u mean...my problem is when i press for e.g letter 'k' it will also restart the program.....i only want the letter 'r' to restart it.

  4. #4
    Algorithm Dissector iMalc's Avatar
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    We know what you want to do, and we know exactly why it doesn't work and how it should be done properly.

    The problem is that with your skill level you are unable to understand the responses given to you. The way to proceed forward is for you to ask questions about specific things in the responses given so far. For example if you don't know what an "uninitialised variable" is, then ask about that.

    quit is also uninitialised when it is first compared against 'q'.
    Probably your main mistake though, and it's really a design problem, is that you should only have one loop, not two.
    My homepage
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  5. #5
    Registered User
    Join Date
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    11
    Quote Originally Posted by imjustnew View Post
    hi i want the program below to restart only when specific letter is entered from keyboard....at this point the program accept any letter to restart except 'q'.

    so how im gonna do it will only except letter 'r' to restart? thanks.


    [tag]
    Code:
    #include <iostream>
    #include <stdio.h>
    #include <stdlib.h>
    #include <string>
    
    
    using namespace std;
    
    int main (int argc, char *argv[])
    
    {
       char again, quit ;//quit:not assign value to variable?(Note:while loop)
       string name = "";
       while (quit != 'q')//Why?
            
            do{
                system ("cls");
                
                cout << "Hello, what is your name? \n";
                cin >> name;
     
                cout << "Hi " << name;
              
                
                cout << "\n Please press r to restart or q to quit and press enter";
                cin >> quit;
               
                  
            }               
                    
        
                   
            while(toupper(again) == 'r'); //restart program
    
    return 0;
    }
    [/tag]
    Error your basic.
    Sorry my english is very bad!.

  6. #6
    Registered User rogster001's Avatar
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    Liverpool UK
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    This seems to be a thread of two halves, there is another one that has been replied to more recently, regarding , quit rather than restart.

    Anyway, it is being shown to you that your 'quit' variable has to be initialised for the while loop.
    In any case you should think a little more descriptively about the variable names and use in the loop, just for clarity...
    that is why in the other post i used ('while goAgain is true'...(keep working..) ), rather than what you are saying here, 'while quit is not (q)uit'.

    And you do not need two loops in your present scenario, as has already been pointed out.
    Apart from a programming excercise, for me it is kind of redundant here to have stop/continue as two variables, just ask for input at the end of each loop and advise the user 'press (q) to exit or any other key to go again' and then test the input accordingly.
    Last edited by rogster001; 01-06-2012 at 02:02 AM.
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