I'm trying to use the ANSI ''stringizing'' preprocessing operator '#' to insert the value of a symbolic constant into a message, but it keeps stringizing the macro's name rather than its value. C's preprocessor is not intended as a general-purpose tool. (Note also that it is not guaranteed to be available as a separate program.) Rather than forcing it to do something inappropriate, you might want to write your own little special-purpose preprocessing tool, instead.

Some pre-ANSI compilers/preprocessors interpreted macro definitions like #define TRACE(var, fmt) printf("TRACE: var = fmt\n", var) such that invocations like TRACE(i, %d); were expanded as printf("TRACE: i = %d\n", i); In other words, macro parameters were expanded even inside string literals and character constants. (This interpretation may even have been an accident of early implementations, but it can prove useful for macros like this. See similar questions...

Some pre-ANSI compilers/preprocessors expanded macro parameters even inside string literals and character constants. Under ANSI C, #ifdef'ed-out text must still consist of "valid preprocessing tokens." This means that there must be no newlines inside quotes, and no unterminated comments or quotes (i.e. no single apostrophes). See similar questions...

The SQL standard specifies that single-quotes in strings are escaped by putting two single quotes in a row. SQL works like the Pascal programming language in the regard. SQLite follows this standard. Example: INSERT INTO xyz VALUES('5 O''clock'); See similar questions...

Read comments in the code. #include<iostream> using namespace std; class A { public: A(int a1,int a2) {x=a1; y=a2;} void print() const; // readonly parameter x1 void setX(const int x1) {x = x1;}n // y1 is allowed to change void setY(int y1) {y1++; y = y1;} // function is not allowed to change the class members int getXplusY() const { return x+y;} private: int x,y; }; void A::print() const { cout<<x<<":"<<y<<endl; //notice :!!!! } int main(){ A obj1(10,30); obj1. See similar questions...

It is frequently asked how some XML (esp. See similar questions...

SPARQL provides the function, regex(), which can be used to test whether a literal value contains a certain substring: SELECT ?title WHERE { _:book :title ?title . FILTER (regex(?title, "SPARQL")) . } The regex() function expects its first argument to be either a plain literal without a language tag or else a typed literal with a datatype of xsd:string. Plain literals with a language tag or typed literals of other datatypes will evaluate to a type error which causes the filter to fail. See similar questions...

wgSpamRegex is a powerful filter for page content. Adding multiple items to the regex, however, can be awkward. Consider this snippet: wgSpamRegexLines[] = 'display\s*:\s*none'; $wgSpamRegexLines[] = 'overflow:\s*\s*auto'; [...] $wgSpamRegex = '/(' . implode( '|', $wgSpamRegexLines ) . ')/i'; This example code allows convenient addition of additional items to the regex without fiddling about each time. It also demonstrates two popular filters, which block some of the most common spam attacks. See similar questions...

Are you looking for more distance on your shots or more control over them? Generally, if you string at the lower end of your racquet's recommended tension range, the same stroke will make the ball fly farther. Adjust string tension according to desired effect. Low tension = deeper shots. High tension = shorter shots. any given swing speed, higher string tensions improve control. High tension = better control. Low tension = less control. See similar questions...

Section 5.3. of R5RS states Although macros may expand into definitions and syntax definitions in any context that permits them, it is an error for a definition or syntax definition to shadow a syntactic keyword whose meaning is needed to determine whether some form in the group of forms that contains the shadowing definition is in fact a definition, or, for internal definitions, is needed to determine the boundary between the group and the expressions that follow the group. See similar questions...

Pattern variables that occur in subpatterns followed by one or more instances of the identifier ... are allowed only in subtemplates that are followed by as many instances of .... They are replaced in the output by all of the subforms they match in the input, distributed as indicated. It is an error if the output cannot be built up as specified. It is important to understand what is meant by "followed" in the above. Take for example the pattern (a (b c ...) (d e ...) .. See similar questions...

Why is the original _L macro now deprecated in all but test code? These have the advantage of being used in place rather than declared separately, for example: Well, the text, for example "TEST SERVER" is built into ROM as a basic, NULL-terminated C style string, with no initial length member. Because the layout of the stored literal is not like that of a descriptor, it means that when each instance of the literal is used, a temporary TPtrC must be constructed around the data in ROM. See similar questions...

A string literal such as @"c:\Foo" is called a verbatim string literal. It basically means, "don't apply any interpretations to characters until the next quote character is reached". So, a verbatim string literal can contain backslashes (without them being doubled-up) and even line separators. To get a double-quote (") within a verbatim literal, you need to just double it, e.g. @"My name is ""Jon""" represents the string My name is "Jon". See similar questions...

If you have something like: <article> <title>An article about something</title> <body> Some html (not XHTML) data here <br> And some more text. </body> </article> then this simply 'cannot' be processed by digester. Digester is a layer on top of a standard XML parser, and as this is not valid XML the underlying parser will not allow it. Your best option is to wrap the non-xml content in a CDATA section (see the preceding FAQ entry). See similar questions...

MACRO Golf not only provides its clients with a Tour-tested putter, but also a putting system that will lower your score. There are two ways to get instruction in the split grip system advocated by Macro Golf: Free DVD: MACRO Golf has produced a short DVD providing an extended version of the instruction found on this site. It provides a comprehensive overview of hand placement, stance, stroke and drills to improve your putting consistency after a few practice rounds. See similar questions...

Its all about string tension, feel and tuning. For example, 9 gauge strings (9 - 42) are considered normal for electric guitars and they come standard on most brands. These are great for people who play in E Standard tuning (or Drop D) with a light touch and want easy string bending. The next step up is 10 gauge strings (10 - 46) which you can still tune to E Standard for a stiffer feel or tune down a half step to E Flat Standard (or Drop C Sharp) for the same tension as 9 gauge strings. See similar questions...

Each ornament has a different length of string used and it is best not to cut the string from the ball until you are finished with the ornament. See similar questions...

Yes and no. Outdoor models are designed for well ventilated places. Well ventilated does not mean you have a bit of a draft under a crack in the door. In a garage with a window or garage door open, yes you can safely use any of the 12-IR -> 24-IR range of heaters The DESA range of infra-red heaters is the way to go for indoor infra-red heat. These units are designed for indoor use and have safety mechanisms built in to protect you. See similar questions...

Nope. We don't think that the world is an empty, meaningless place, even though we don't think a god designed it. We think the world is a fascinating, wonderful, interesting place, and we enjoy living in it. Now, you may think that it's impossible to "really" enjoy this world without believing of God as the designer. We don't feel that way. See similar questions...