Appending char to C-Style string

[Yinyang107]

I need to append one character from C-style String X (not necessarily the first char) to C-Style String Y. I was thinking of doing it thusly (this is in a for loop):

strncat(X, Y[i], 1)

where Y[i] is the char to copy. Two questions:

1. Will this work?

2. Is there a better way?

[anon]

If Y is a C-style string, then you should be passing &Y[i] which is a pointer to that location in the string, not a character value.

[Yinyang107]

Oh yeah, good point.

[Eman]

it should be safe as long you don't go out of bounds....
but if you intend to use a loop...I am not sure if there is a point in using strncat?
lol i would've just assigned it..although that is also a function

[Yinyang107]

How would I do it without strncat? X += y[i] or something?

I need to do it in a loop because it checks if each stage is valid. For instance, where Y = 802143735:

X=8
valid? no
X=80
valid? no
X=802
valid? no
X=8021
valid? yes
exit loop

[Eman]

your life would be easier if you use the std::string object..is X a string object? if it is
can I ask what makes X valid? does it compare with some previous Y string?
if so

while(X!=Y)
   X+=Y[i] ;

although you can try

while(!X.compare(Y))
   X+=Y[i] ;

you will have to check the return value of compare...sorry I can't remember

or if you
i think should solve it for you.