instead of goto

This is a discussion on instead of goto within the C++ Programming forums, part of the General Programming Boards category; what can u use instead of goto and why is this a bad way to write your codes...

  1. #1
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    instead of goto

    what can u use instead of goto and why is this a bad way to
    write your codes

  2. #2
    ¡Amo fútbol!
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    It is not liked by many because people think it creates sloppy code.

    It can be prevented by making the code a function or using loops. It matters how you are using it.

  3. #3
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    somthing like this


    cout<<"what's your answer";

    int answer;

    cin>>answer;

    //if the answer is more than 10 answer again
    if(answer>10)
    //.........what now

  4. #4
    Code Goddess Prelude's Avatar
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    >what can u use instead of goto
    You can usually avoid goto with a simple change in program flow or an extra variable, it's rarely hard.

    >and why is this a bad way to write your codes
    It's not a bad way to write code, but goto is easily abused. It's that abuse that everyone fears.

    -Prelude
    My best code is written with the delete key.

  5. #5
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    I was advised that goto's are only useful for efficiently escaping deeply nested loops. But good programming shouldnt require more than about 4 levels of nesting (that'll probaby start an argument!) and I have still never used a goto statement

  6. #6
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    s how should i write the code above ^^^

  7. #7
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    I don't know if it's the best way but instead of goto i use a while statement that continues and restarts until you make the while statement false and then it moves on.

    int main(){
    int 1st, 2nd;
    int 1st = 1;
    int 2nd = 1;

    while(1st==2nd)
    {
    //your code
    int 2nd = 2; //Set this to one and it will continue to the code again
    }
    return 0;
    }
    ~Silencer~
    What is this "C.O.D.E." you speak of?

  8. #8
    Just because ygfperson's Avatar
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    Code:
    cout<<"what's your answer"; 
    
    int answer; 
    
    cin>>answer; 
    
    //if the answer is more than 10 answer again 
    if(answer>10) 
    //.........what now
    change it around so it all goes inside a while loop:
    Code:
    int answer=99999;
    
    while (answer>10) {
     cin >> answer;
    }
    if you wanted to warn after a bad answer:
    Code:
    int answer;
    cin >> answer;
    
    while (answer>10) {
     cout << endl << "sorry, try again" << endl;
     cin >> answer;
    }

  9. #9
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    yes but i see u used cin>> one more time but that's exactly what i dont want to do


    while (answer>10) {
    cout << endl << "sorry, try again" << endl;
    cin >> answer; /// see what i mean!
    }

  10. #10
    Ryce
    Guest
    duno why u dont want cin>> again but try this...

    int answer = 0;
    cout << "Answer: ";
    do
    {
    cin>>answer;

    if(answer>10)
    {
    cout << "ERROR! " << endl;
    }
    }while(answer<10);

    should work

  11. #11
    Registered User Paro's Avatar
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    Question

    i've never heard of goto, how do you use it? i may need to use it someday in like someone said a REALLY nested loop...or should i never learn it? i say knowledge is power
    Paro

  12. #12
    ¡Amo fútbol!
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    Goto is pretty self explanatory, it makes the program goto a certain spot in the code.

    Code:
    int dummy;
    cin>>dummy;
    if (dummy==7) goto LABEL1;
    cout<<"you did not enter 7";
    return 0;
    LABEL1:
    cout<<"you entered 7";
    return 0;

  13. #13
    Registered User Paro's Avatar
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    Talking

    it seems to be VERY helpful! why shouldnt i use it? it looks like it is the best idea since sliced bread!!!

    SOMEONE TELL ME WHY I CANT USE IT OR I WILL!!!
    Paro

  14. #14
    ¡Amo fútbol!
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    No one is saying that you cannot use it, but, it is just not liked by programmers. It creates very hard to read code because you have to look all over the place.

  15. #15
    Registered User Paro's Avatar
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    ok, i think i will use it then, because it makes it easier for me
    Paro

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