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cswitch-statementgetch
Acajou
Acajou

Reputation: 21

Go back to the beginning of switch (getch() ) in the default ? (c)

I am currently coding in C and using switch & getch, like this :

c=getch(); 
switch(c)
        {
            case 17: 
            //something
            break;

            case 19: 
            //something else
            break;

            default: //loop to get the right "case"
            break;

        }

However, I want to loop my switch in the case of we get into the "default". Does anything exist for that ? Or should I make a "while (x!=10)" -for example- looping my whole switch, and if I go into default, x==10??

Thanks a lot in advance !

Upvotes: 2

Views: 4528

Answers (4)

user4815162342
user4815162342

Reputation: 154916

If you find goto distasteful, you can create a dummy loop and use continue after default: to force next loop iteration:

do {
  c = getch();
  switch(c) {
    case 17: 
      //something
      break;
    // ...
    default:
      continue;
  }
} while (false);

Upvotes: 6

user3629249
user3629249

Reputation: 16540

For best coding practices, just forget that the goto exists.

The following code does what you want

int  done = 0; // indicate not done
while( !done )
{
    done = 1; // indicate done
    //c=getch();  not portable, do not use
    c = getchar();

    switch(c)
    {
        case 17:
        //something
        break;

        case 19:
        //something else
        break;

        default: //loop to get the right "case"
            done = 0;  // oops, not done, so stay in loop
        break;
    } // end switch
} // end while

Upvotes: 1

Enamul Hassan
Enamul Hassan

Reputation: 5445

Though it is discouraged by most of the programmers to use goto, because of hampering to keep track of the flow of the program, you can use it. The statements are syntactically valid.

#include <stdio.h>
#include <conio.h>

int main()
{
    char c;
xx:
    c=getch();
    switch(c)
    {
    case 17:
        //something
        break;

    case 19:
        //something else
        break;

    default: //loop to get the right "case"
        goto xx;
        break;

    }

    return 0;
}

Upvotes: 1

Vlad from Moscow
Vlad from Moscow

Reputation: 310980

You can use do-while loop,. For example

int done;

do
{
    done = 1;

    c =getch(); 
    switch( c )
    {
        case 17: 
        //something
        break;

        case 19: 
            //something else
            break;

        default: //loop to get the right "case"
            done = 0;
            break;
    }
} while ( !done );

Upvotes: 3

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