problem with carraige return...

[ayan4u]

now at the end of my out put i am putting a carriage return "\r" s that i can gain output on the same line but i am facing a problem...

such that...

cout<<"My name is Ayan \r";
system("pause");
cout<<"lalala";
 

this make like this :

lalalae is Ayan

i.e all after "My name" remains in the second output....as if i am gettn a feedback from my previous output....how to tackle this...plez help...

[JosAH]

now at the end of my out put i am putting a carriage return "\r" s that i can gain output on the same line but i am facing a problem...

such that...

cout<<"My name is Ayan \r";
system("pause");
cout<<"lalala";
 

this make like this :

lalalae is Ayan

i.e all after "My name" remains in the second output....as if i am gettn a feedback from my previous output....how to tackle this...plez help...

Yep, nothing told your console to clear the rest of that line so previous output
remains visible. You could do it the quick and dirty way:

cout<<"My name is Ayan \r";
system("pause"); 
cout<<"lalala            "; // enough spaces
 

kind regards,

Jos

[ayan4u]

Yep, nothing told your console to clear the rest of that line so previous output
remains visible. You could do it the quick and dirty way:

cout<<"My name is Ayan \r";
system("pause"); 
cout<<"lalala "; // enough spaces
 

kind regards,

Jos

but this blocks my execution....which i dnt want...i thought of a process of getting the length my previous output and print space through out the output...then print my new output....i know its dirty but do you have any better alternative(s)...

[Ganon11]

You can use system("cls") to clear the entire screen of output, but not just the previous line. Will this work for you?

[ayan4u]

You can use system("cls") to clear the entire screen of output, but not just the previous line. Will this work for you?

i already experimented with that...but since its between a never ending loop...only to be ended by a keyboard input...

 
while(!_kbhit())
{
 
code...
 
}
 

so if i use system("CLS") it takes much CPU time and screen flickers...and its too a OS dependent alternative and nasty one too..


any other better alternatives....

[JosAH]

but this blocks my execution....which i dnt want...i thought of a process of getting the length my previous output and print space through out the output...then print my new output....i know its dirty but do you have any better alternative(s)...

I don't understand what you mean by "but this blocks my execution". The little
hack I supplied works identical to what you wrote in your OP; it just prints
enough spaces to erase previous characters on that line. Nothing blocks.

kind regards,

Jos

[ayan4u]

I don't understand what you mean by "but this blocks my execution". The little
hack I supplied works identical to what you wrote in your OP; it just prints
enough spaces to erase previous characters on that line. Nothing blocks.

kind regards,

Jos

ok let me explain....and its very hard to do so without posting the full code...but i am trying to be as simple as i can

srand(time(0));
 
while(!_kbhit()
{
cout<<"The random number is :" <<rand()<<" \r";
} 
 
 

now suppose for the first time the random number generated is 1000

so its prints ...

The random number is :1000

now the next random number be 3 but it will print

The random number is :3000

000 as a feedback from previous output...
now u proposed system(pause);

now if i design the code for minimum user interaction ur proposal defies it....as it will wait for a key press....and as a sideeffect my loop ends...as my loop is also waiting for a key press to terminate...

phewwww...well i think i presented my problem well...

[JosAH]

ok let me explain....and its very hard to do so without posting the full code...but i am trying to be as simple as i can

srand(time(0));
 
while(!_kbhit()
{
cout<<"The random number is :" <<rand()<<" \r";
} 
 
 

now suppose for the first time the random number generated is 1000

so its prints ...

The random number is :1000

now the next random number be 3 but it will print

The random number is :3000

000 as a feedback from previous output...
now u proposed system(pause);

now if i design the code for minimum user interaction ur proposal defies it....as it will wait for a key press....and as a sideeffect my loop ends...as my loop is also waiting for a key press to terminate...

phewwww...well i think i presented my problem well...

Well, the system("pause") was your idea (see your original article) and I just
copied it. And when I wrote "enough spaces" that didn't imply "exactly enough"
spaces, maybe an additional, say, 50 spaces can do it (if the line lengths don't
differ more than 50 characters).

kind regards,

Jos

[ayan4u]

Well, the system("pause") was your idea (see your original article) and I just
copied it. And when I wrote "enough spaces" that didn't imply "exactly enough"
spaces, maybe an additional, say, 50 spaces can do it (if the line lengths don't
differ more than 50 characters).

kind regards,

Jos

hmm ....my original post confused you...ok ignore it and think about my last post...and the problem i showcased...

[AdrianH]

If you know the length of what you are outputing, then you should be able to determine how many spaces (if you want to use the exact number of spaces to clear the rest of the line). However, as Jos said, you could print out a bunch of excess spaces (the maximum you think you would require that would not cause you to move to the next line) to wipe any excess characters.

An alternative to '\r' is to use '\b' a bunch of times to backspace from the end to where you want to start writing. It requires more code and you to know how many characters to backspace over. In certain cases this may be slower or faster, depening on how many backspaces you do compaired with how many characters you would have to print out from the begining of the line. The more characters you output, the slower it will be.

Does this help?


Adrian

[ayan4u]

If you know the length of what you are outputing, then you should be able to determine how many spaces (if you want to use the exact number of spaces to clear the rest of the line). However, as Jos said, you could print out a bunch of excess spaces (the maximum you think you would require that would not cause you to move to the next line) to wipe any excess characters.

An alternative to '\r' is to use '\b' a bunch of times to backspace from the end to where you want to start writing. It requires more code and you to know how many characters to backspace over. In certain cases this may be slower or faster, depening on how many backspaces you do compaired with how many characters you would have to print out from the begining of the line. The more characters you output, the slower it will be.

Does this help?


Adrian

thnx Adrian about this /b idea sounds good and i will implement that...atleast its a bit better than the "filling up with spaces" technique for my case....

neways thanks to all of you for your coopeartion....i wll post if i face any difficulty regarding this any more....

[JosAH]

thnx Adrian about this /b idea sounds good and i will implement that...atleast its a bit better than the "filling up with spaces" technique for my case....

neways thanks to all of you for your coopeartion....i wll post if i face any difficulty regarding this any more....

Not all terminals wipe out a previous character when a '\b' is printed. You still
have to print spaces over the previous output then.

kind regards,

Jos

[AdrianH]

Not all terminals wipe out a previous character when a '\b' is printed. You still
have to print spaces over the previous output then.

kind regards,

Jos

Yeah, I wasn't meaning that the backspace would delete the character, it just moves the cursor to the left in all of the terminals I have ever used.


Adrian