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- Dictionarycon·cat·e·na·tion/kənˌkadəˈnāSH(ə)n/
noun
- 1. a series of interconnected things or events: "a singular concatenation of events unlikely to recur"
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Nov 21, 2008 · 485. In C, "strings" are just plain char arrays. Therefore, you can't directly concatenate them with other "strings". You can use the strcat function, which appends the string pointed to by src to the end of the string pointed to by dest: Here is an example from cplusplus.com: char str [80]; strcpy (str, "these "); strcat (str, "strings ...
Sep 29, 2009 · #define CAT(x) pref_ ## x #define Y a #define pref_Y asdf CAT(Y) and now the result would be: asdf because on Step 3 above pref_Y is now defined as a macro, and therefore expands. Step-by-step example with indirection. If we use the two step pattern however: #define CAT2(x) pref_ ## x #define CAT(x) CAT2(x) #define Y a CAT(Y) we get: pref_a
Mar 31, 2015 · Try this. #define space_conc(str1,str2) #str1 " " #str2. The '##' is used to concatenate symbols, not strings. Strings can simply be juxtaposed in C, and the compiler will concatenate them, which is what this macro does. First turns str1 and str2 into strings (let's say "hello" and "world" if you use it like this space_conc(hello, world)) and ...
Jan 3, 2010 · There is a C-style trick for achieving the (const/constexpr) string literals concatenation in build time. It should not matter because const char* are actually C-style stuff anyhow. And without dynamic allocations, strlen, and all the ugly stuff posted here. Everything is done by the compiler, nothing during execution.
1. I know this is a bit old, but the correct answer is that concatenation is available till SystemVerilog. So if someone wants to use it: Settings->Analysys & Synthesis Settings->Verilog HDL and check the SystemVerilog. Some of simulators may use it regardless of the choosen standard (like Icarus), which might be a little confusing.
Sep 16, 2016 · href={"#demo" + this.state.id} This will use the string literal #demo and concatenate it to the value of this.state.id. This can then be applied to all strings. Consider this: var text = "world"; And this: {"Hello " + text + " Andrew"} This will yield: Hello world Andrew.
Sep 3, 2010 · 7. It is impossible. C preprocessors work by processing tokens, and they do not do any resolution or substitution that would require knowledge of the mechanics of the language (except basic arithmetic involving integer literals, off the top of my head). Consider, for example, the docs for GCC's preprocessor regarding tokenisation.
So, you have to use some extra layers of indirection, you can use the token-pasting operator with a recursively expanded argument: #define TOKENPASTE(x, y) x ## y. #define TOKENPASTE2(x, y) TOKENPASTE(x, y) #define UNIQUE static void TOKENPASTE2(Unique_, __LINE__)(void) {} Then, __LINE__ gets expanded to the line number during the expansion of ...
Nov 28, 2012 · Then you can use. (<>) :: Monoid m => m -> m -> m. which is an alias for mappend (I thought it was already a type class member, but it isn't :/). Lists hava a Monoid instance where mappend is (++), so that would do what you desire. The Monoid instance also gives you. mconcat :: Monoid m => [m] -> m. which you can use to concatenate a list of ...
Dec 26, 2012 · Putting two or more literal strings together gets you the concatenation of those strings. "Hello " "World" "!!" /* is the same as */. "Hello World!!" Remember, only literal strings will do this. This does not work for variables. Think of macros like a find/replace in your code.
