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- Dictionaryconcatenation/kənˌkatɪˈneɪʃn/
noun
- 1. a series of interconnected things: "a concatenation of events which had finally led to the murder"
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Mar 10, 2011 · 231. If they're both strings you can just do: #define STR3 STR1 STR2. This then expands to: #define STR3 "s" "1". and in the C language, separating two strings with space as in "s" "1" is exactly equivalent to having a single string "s1". edited Nov 3, 2020 at 8:12. Ciro Santilli OurBigBook.com. 375k 114 1.3k 1k.
Mar 11, 2014 · 5 Answers. Sorted by: 2. You can generally use the ## (double number sign) to concatenates two tokens in a macro invocation. However, since you have string literals jamming an already defined macro, you could just use spaces, else you could run into invalid preprocessing token. Also, you should escape your backslash.
May 4, 2016 · 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 ...
Dec 15, 2014 · A macro which takes the name of a command as an argument can make this unnecessary. The string constant can be created with stringification, and the function name by concatenating the argument with _command. Here is how it is done: #define COMMAND(NAME) { #NAME, NAME ## _command } struct command commands[] =. {.
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
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.
String literals can be concatenated this way "str1""str2". macro function can concatenate two string literals - #define STRCAT(str1, str2) str1##str2. And when it comes to variables, you use strcat() More efficient approach is to use string managing utilities such as GString. It keeps track of the end of string and it handles memory expansions ...
Jul 21, 2016 · The compiler will automatically concatenate adjacent strings: #define ROOT_PATH "/home/david/". #define INPUT_FILE_A ROOT_PATH "data/inputA.bin". Or more generic: #define INPUT_FILE_DETAIL(root,x) root #x. #define INPUT_FILE(x) INPUT_FILE_DETAIL(ROOT_PATH "data/", x) edited Nov 15, 2009 at 22:43. answered Nov 15, 2009 at 22:35.
May 22, 2017 · 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: char *strcat(char *dest, const char *src); Here is an example from cplusplus.com:
The actual design has several addresses and this type of case statement is repeated several times. Rather than type out all the defines over and over for each one, I'd like to create another define that looks like this: case(sys_mgr_address) PWM_MODULE_BLOCK_RAM_ADDRESSES : begin // Values for block RAM.
