ld: symbol(s) not found for architecture x86_64 error
I am trying to follow http://gnuu.org/2009/09/18/writing-your-own-toy-compiler tutorial. I am getting the following error. What am I missing?
C++
C++ Cout & Cin & System “Ambiguous” [closed]
This kind of thing doesn’t just magically happen on its own; you changed something! In industry we use version control to make regular savepoints, so when something goes wrong we can trace back the specific changes we made that resulted in that problem. Since you haven’t done that here, we can only really guess. In … Read more
What is the effect of extern “C” in C++?
extern “C” makes a function-name in C++ have C linkage (compiler does not mangle the name) so that client C code can link to (use) your function using a C compatible header file that contains just the declaration of your function. Your function definition is contained in a binary format (that was compiled by your … Read more
Using getline() with file input in C++
getline, as it name states, read a whole line, or at least till a delimiter that can be specified. So the answer is “no”, getlinedoes not match your need. But you can do something like:
C++ — expected primary-expression before ‘ ‘
You don’t need “string” in your call to wordLengthFunction(). int wordLength = wordLengthFunction(string word); should be int wordLength = wordLengthFunction(word);
How to convert string to char array in C++?
Simplest way I can think of doing it is: For safety, you might prefer: or could be in this fashion:
Sleep for milliseconds
Note that there is no standard C API for milliseconds, so (on Unix) you will have to settle for usleep, which accepts microseconds:
How do I find the length of an array?
If you mean a C-style array, then you can do something like: This doesn’t work on pointers (i.e. it won’t work for either of the following): or: In C++, if you want this kind of behavior, then you should be using a container class; probably std::vector.
What is an undefined reference/unresolved external symbol error and how do I fix it?
Compiling a C++ program takes place in several steps, as specified by 2.2 (credits to Keith Thompson for the reference): The precedence among the syntax rules of translation is specified by the following phases [see footnote]. Physical source file characters are mapped, in an implementation-defined manner, to the basic source character set (introducing new-line characters for end-of-line indicators) … Read more
pinpointing “conditional jump or move depends on uninitialized value(s)” valgrind message
Use the valgrind option –track-origins=yes to have it track the origin of uninitialized values. This will make it slower and take more memory, but can be very helpful if you need to track down the origin of an uninitialized value. Update: Regarding the point at which the uninitialized value is reported, the valgrind manual states: It is important to … Read more