In visual basic I have the following 2 strings:
"\\.\" & "\"
How do I represent them in C?
Also, & in VB is the concatenation operator?
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46answers:
3
+3
A:
The \ is an escape character so if you want to print \ you need to put two of them: \\
To concatenate two string you can use strcat(string1, string 2) which is shown here.
Kyra
2010-06-22 16:28:58
-1: C has no concatenation operator. The C++ string class overrides operator+ to provide similar functionality, but by no means is that a core language operator even in C++.
Billy ONeal
2010-06-22 16:30:39
oops. Just changed it. thanks
Kyra
2010-06-22 16:33:22
+1 for the edited answer. @Billy ONeal, you might consider removing your downvote after the correction.
Fred Larson
2010-06-22 16:35:29
The second part of the question is about VB...
pcent
2010-06-22 16:36:36
I got the second part from a C tutorial. From http://www.java2s.com/Code/C/String/Demonstrateshowtoputstringstogetherusingstrcat.htm, http://www.roseindia.net/c-tutorials/c-str-con.shtml and http://stackoverflow.com/questions/308695/c-string-concatenation
Kyra
2010-06-22 16:45:58
@Fred Larson: Downvote removed.
Billy ONeal
2010-06-22 17:06:11
@Kyra: Yes, but I'd avoid `strcat` and the other `<string.h>` facilities if at all possible (though no downvote for that :) ).
Billy ONeal
2010-06-22 17:08:11
Two string literals, as in this question, can actually be concatenated simply by placing them next to each other.
caf
2010-06-23 00:32:08
+1
A:
As others have said, the backslash character () in C is an escape character. Look at http://msdn.microsoft.com/en-us/library/h21280bw%28VS.80%29.aspx to find more about it.
So your strings come out as follows:
"\\.\" is "\\\\.\\"
"\" is "\\"
There are many ways to concatenate strings.
puts("Hello" " " "World");
will print "Hello World".
A common way is to use strcat().
char szBuff[60]; /* szBuff is an array of size 60 */
strcpy(szBuff, "Hello"); /* szBuff contains "Hello" */
strcat(szBuff, " World"); /* szBuff contains "Hello World" */
strcat(szBuff, " from Michael"); /* now contains the whole sentence */
strcpy(szBuff, "New message"); /* strcpy overwrites the old contents */
Michael J
2010-06-22 17:05:00
Ok, but one should avoid the facilities in `<string.h>` unless you have no other choice.
Billy ONeal
2010-06-22 17:07:08
@Billy: Why? In C++ there are better ways, but in C <string.h> is generally the preferred way to manipulate strings. How would you recommend doing it?
Michael J
2010-06-22 22:09:46
@Michael J: If available I'd recommend writing them yourself using ways that accept a buffer length input, or using something like the Safe C String library M$ uses (strcpy_s, strcat_s, and friends). Why the C standard uses a method that allows such easy buffer overflows when length-prefixed strings were available does not make sense to me.
Billy ONeal
2010-06-22 23:13:09