how to remove useless output after reverse of string in code?

Question

https://code.sololearn.com/cwTpUaphjD4l/?ref=app

Answer 1

You have:
for(i=l;l>=0;i--)

That should be:
for(i=l;i>=0;i--)

Your original code's for loop basically never stops, so it ends up reading garbage in memory, since i keeps decrementing indefinitely. All the junky characters you see is your program interpreting as characters the contents of the memory following the array b.

Answer 2

thnks

Answer 3

btw any suggestion how to remove silly mistkaes like this?
any suggestions for reading code?

Answer 4

I correct myself for the last part: the junky memory is the one preceding b, since i becomes a negative number

Answer 5

Well, you need to get used to read code, and that comes with experience. Such mistakes can be hard to find. A big warning sign in this case was the junky characters: that is usually a sign of reading garbage and interpreting it as a string, something that happens when you forget the null terminator.

There are some tools that can help though: on Linux there is Valgrind, that detects this kind of mistakes (and much more).

Answer 6

oh thnks a lot for this info

Answer 7

You're very welcome! :)