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| Wednesday, April 05, 2006 |
| Teaser! |
I was facing a problem in a "single line text editor" kind of code. It is "kind of" but not the actual editor since select copy paste and all the weird thins are not there. A simple section of pseudo code is as:
do
{
if (key == backspace)
{
string[index]='\0';
index--;
}
else if(isprint(key))
{
string[index]=key;
index++;
}
printf("\r%s",string);
}while(key = getkey() != Enterkey);
getkey is more like getch.
As you can see if I give backspace the change will not be reflected on the screen. How do I refelect it?
The fix is not a great deal. I took sometime to settle on the soultion.
PS: Assume support of conio is not there. |
posted by Sunil @ 5:37 AM   |
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| 3 Comments: |
-
Well pradeep, I don't expect the exact answer as I have in my mind. Anything better is also fine. Your idea is close to mine, but won't work :)
If i enter a sequence
abcd[backspace][backspace]123
string will be
abcd123
Sundaravana, if you mean adding \n in place of \r? But it will screw the display right?
-
if (backspace)
{
string[index--] = 'space';
string[index] = '\0';
}
Initial String:
abc(null)=>[index=3]
If you enter backspace,
abc(backspace)=>string[3]=' ' and string[2]='\0'
ab(null)(space)->this will be the new string
This won't work again.
I will give a clue (or constraint), you could add/remove/modify exactly 3 characters :)
At any point the variable string should not contain stray spaces. Only the user entered character should go there.
-
Bingo!!!
That is what I had in my mind da. I already told your idea of adding space at the end is closer to mine.
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Well pradeep, I don't expect the exact answer as I have in my mind. Anything better is also fine. Your idea is close to mine, but won't work :)
If i enter a sequence
abcd[backspace][backspace]123
string will be
abcd123
Sundaravana, if you mean adding \n in place of \r? But it will screw the display right?