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1. Top results related to what are the function of dictionary in c compiler language

   • What are the benefits of function pointers in C?

     Top Answer

     Answered Jul 19, 2017 · 3 votes

     • Same as regular typdefs, incredibly useful for 2 and 4. Instead of typing the whole thing, you can now use myFuncDef
     • A function declaration for a function that recieves a function pointer. A function that takes a function pointer of 1. would thus look int add2to3(myFuncDef functionPtr);
     • -
     • A function that takes an int and (probably based on that) returns you a function pointer. Using the typedef it would have looked like myFuncDef functionFactory(int n);

     Without typedefs these chains of pointers to pointers could get incredibly long as can be seen in this question: C syntax for functions returning function pointers

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   • What are the semantics of function pointers with empty parentheses in each C standard?

     Top Answer

     Answered Mar 25, 2018 · 2 votes

     N1570 6.11.6:

     The use of function declarators with empty parentheses (not prototype-format parameter type declarators) is an obsolescent feature.

     This same wording appears in the 1990, 1999, and 2011 editions of the ISO C standard. There has been no change. The word obsolescent says that the feature may be removed in a future edition of the Standard, but so far the committee has not done so. (Function pointer declarations are just one of several contexts where function declarators can appear.)

     The Introduction section of the C standard explains what obsolescent means:

     Certain features are obsolescent, which means that they may be considered for withdrawal in future revisions of this International Standard. They are retained because of their widespread use, but their use in new implementations (for implementation features) or new programs (for language [6.11] or library features [7.31]) is discouraged.

     A call to a function declared with an old-style declarator is still required to pass the correct number and type(s) of arguments (after promotion) as defined by the function's actual definition. A call with incorrect arguments has undefined behavior, which means that the compiler is not required to diagnose the error; the burden is entirely on the programmer.

     This is why prototypes were introduced, so that the compiler could check correctness of arguments.

     On an i386 system with GCC, “extra” arguments passed in a call to an empty-parentheses-type’d function pointer are ignored, because of how stack frames work ...

     Yes, that's well within the bounds of undefined behavior. The worst symptom of undefined behavior is having the program work exactly as you expect it to. It means that you have a bug that hasn't exhibited itself yet, and it will be difficult to track it down.

     You should not depend on that unless you have a very good reason to do so.

     If you change

     int (*fp)() = foo;-

     to

     int (*fp)(int) = foo;-

     the compiler will diagnose the incorrect call.

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     2/5

   • What are the different between calling constructor and calling function pointer of constructor in C++

     Top Answer

     Answered Jan 28, 2024 · 0 votes

     Calling a constructor and calling a function pointer of a constructor in C++ are very similar in the sense that they are both quite impossible:

     • You cannot call a constructor in C++.
     • You cannot obtain a pointer to a constructor in C++.

     According to the C++ spec about constructors:

     Constructors have no names and cannot be called directly.

     So, in C++, you do not call constructors. The language does that for you when you use the new keyword, when you declare an object on the stack, etc. The expression new MyClass() might look like a constructor invocation, and it does in fact contain a constructor invocation, and so it might be mistaken for a constructor invocation, but that's not what it is; it is a "new expression", which includes, among other things, an invocation of a constructor. But the other things are crucial: you cannot just skip them and directly invoke the constructor.

     Function pointers of constructors do not exist because normally you cannot take the address of a constructor. If you examine the names exported by the DLL, and somehow figure out which name corresponds to the constructor, and use that name to obtain the entry point of that constructor from the DLL, you are cheating: you are doing something which is not normally supported by the language. As a result, you should not attempt to invoke that entry point. A constructor is only supposed to be invoked by the language.

     Also according to the C++ spec:

     A constructor is a special non-static member function of a class.

     (Emphasis mine.)

     A constructor assumes that memory has been allocated, and proceeds to initialize that memory. The language takes care of the memory allocation, but invoking the constructor directly does not. Since a constructor is non-static, it expects an uninitialized this to be passed to it, but you are not allocating any memory and you are not passing anything to the constructor. The result is exactly as expected: a crash.

     And besides, think about it: the constructor could not be internally allocating the memory, because how would it work then if the object was allocated on the stack? And how would it work if the constructor was being invoked by the constructor of a derived class which presumably occupies more memory?

     You can get your DLL to work by using a factory method. A factory method is a public static method which executes new ClassA() and returns the result, or declares ClassA() and returns it by value. Then, obtain the address of the factory method from the DLL, and invoke it.

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     3/5

   • What are the differences between using pure C with a C compiler and the "C part" of a C++ compiler?

     Top Answer

     Answered Sep 06, 2010 · 33 votes

     There are a lot of minor nitpicks. One that strikes me as being the most obvious is that in C++, you have to cast the return value of malloc. Also structs are automatically typedefed in C++.

     Always use a C compiler for C code, not C++. C++ isn't perfectly compatible with C.

     A few others:

     • In C, declaring void func(); declares a function that hasn't specifed what its arguments are, whereas in C++, void func(); is equivalent to the C void func(void)', taking no arguments;
     • Prototypes are required in C++, whereas it's generally just a warning in C;
     • The type of character constants (like 'a') is int in C and char in C++;
     • The type of string literals is char [] in C and const char [] in C++;
     • Some legitimate variable names in C, like class, are reserved keywords in C++.

     For all those who don't believe me and are downvoting, check out this C code:

     #include <stdlib.h>-int main(int argc, char **argv) { int *i = malloc(sizeof(int));- return 0;}-

     Compilation under gcc is fine, but compilation under g++ gives the following errors:

     test.c: In function `int main(int, char**)':test.c:4: error: invalid conversion from `void*' to `int*'-

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     4/5

   • What are the differences between pointer variable's value & address of normal variable and what are the special purpose of pointers in C?

     Top Answer

     Answered Jun 26, 2017 · 5 votes

     Answering questions in reverse order:

     C does not have array variables....but this is really just working with pointers with an alternative syntax.

     This is incorrect, and you need to toss that bookmark in the trash. It's a common misconception that arrays and pointers are the same thing, but they are not. An array expression will be converted to a pointer expression under most circumstances, and array subscripting is accomplished through pointer arithmetic, but an array object is an actual array, not a pointer.

     If pointer also keeps the variable's address in it and at the same time we can get the variable's address using & sign, can't we do the same task pointer does by deriving the address of any variable? I mean if I don't declare it as pointer and use it as int ptr = &i; in 2nd code snippet and use it as normal variable, what would be the differences?

     That code doesn't illustrate why pointers exist, or why they are useful.

     C actually requires us to use pointers in the following cases:

     • To write to a function's parameters;
     • To track dynamically allocated memory;

     Pointers also make dynamic data structures like trees and lists easy to implement, but they aren't required for it (unless you're using dynamic memory allocation in those structures).

     Writing to a function's parameters

     C passes all function arguments by value; the formal parameter in the function definition is a separate object in memory from the actual parameter in the function call, so any change to the formal parameter is not reflected in the actual parameter. For example, assume the following swap function:

     void swap( int a, int b ) { int t = a; a = b; b = t; }-

     This function exchanges the values in a and b. However, when we call the function as

     int x = 4, y = 5;swap( x, y );-

     the values of x and y won't be updated, because they are different objects than a and b. If we want to update x and y, we have to pass pointers to them:

     swap( &x, &y );-

     and update the function definition as follows:

     void swap( int *a, int *b ) { int t = *a; *a = *b; *b = t; }-

     Instead of swapping the contents of a and b, we swap the contents of the objects that a and b point to. This crops up all the time - think about the scanf function, and how you have to use the & operator on scalar arguments.

     Tracking dynamically allocated memory

     The dynamic memory allocation functions malloc, calloc, and realloc all return pointers to dynamic memory buffers; there's no variable associated with that memory as such.

     char *buffer = malloc( sizeof *buffer * some_length );-

     A pointer is the only way to track that memory.

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2. en.wikipedia.org › wiki › C_(programming_language)C (programming language) - Wikipedia

   en.wikipedia.org › wiki › C_(programming_language)

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   2 days ago · C Programming at Wikibooks. C ( pronounced / ˈsiː / – like the letter c) [6] is a general-purpose computer programming language. It was created in the 1970s by Dennis Ritchie, and remains very widely used and influential. By design, C's features cleanly reflect the capabilities of the targeted CPUs. It has found lasting use in operating ...

   • First appeared: 1972; 51 years ago
   • Stable release: C17, / June 2018; 5 years ago

   • Designed by: Dennis Ritchie

3. www.geeksforgeeks.org › stack-using-linked-list-in-cStack Using Linked List in C - GeeksforGeeks

   www.geeksforgeeks.org › stack-using-linked-list-in-c

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   3 days ago · In C, the stack that is implemented using a linked list can be represented by the pointer to the head node of the linked list. Each node in that linked list represents the element of the stack. The type of linked list here is a singly linked list in which each node consists of a data field and the next pointer. type data; Node* next;

4. People also ask

   What is C programming language used for?

   • C is commonly used on computer architectures that range from the largest supercomputers to the smallest microcontrollers and embedded systems . A successor to the programming language B, C was originally developed at Bell Labs by Ritchie between 1972 and 1973 to construct utilities running on Unix.

   C (programming language) - Wikipedia

   en.wikipedia.org/wiki/C_(programming_language)

   See all results for this question

   Why should you use an online C compiler?

   • You can use an online C compiler to write, run, and debug C code right from a web browser. By using an online C compiler, you get the advantage of writing the C code no matter which operating system you use. Also, online C compilers are fast and easy to use, and you only require an active internet connection and a web browser to access them.

   Top 10 Online C Compilers to Write and Compile Code Faster - Techgee…

   www.techgeekbuzz.com/blog/online-c-compilers/

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   What is a function in C?

   • In C, all executable code is contained within subroutines (also called "functions", though not in the sense of functional programming ). Function parameters are passed by value, although arrays are passed as pointers, i.e. the address of the first item in the array.

   C (programming language) - Wikipedia

   en.wikipedia.org/wiki/C_(programming_language)

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   Should C++ work with other programming languages?

   • C++ should work alongside other existing programming languages, rather than fostering its own separate and incompatible programming environment. If the programmer's intent is unknown, allow the programmer to specify it by providing manual control. C++ is standardized by an ISO working group known as JTC1/SC22/WG21.

   C++ - Wikipedia

   en.wikipedia.org/wiki/C++

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5. pwskills.com › blog › c-programming-examplesC Programming Examples For Beginners With Solutions & Output

   pwskills.com › blog › c-programming-examples

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   5 days ago · Learners can also download c programming examples with output PDF to start their C language journey. But practice is the key to learning C language properly. Here are some of the best C programming examples with output: 1. C Program to Check Whether a Number is Positive, Negative, or Zero. #include <stdio.h> int main() { int num;

   • Why is it essential to practice C programming examples?

     Practicing C programming examples is crucial for several reasons. It helps reinforce theoretical knowledge, enhances problem-solving skills, and pr...
   • What is the purpose of the "Swap Two Numbers" program?

     The "Swap Two Numbers" program is designed to interchange the values of two variables. It is a fundamental programming exercise that helps users un...
   • Where can I find more C programming examples for practice?

     You can find more C programming examples for practice on online platforms, programming websites, and educational resources.
   • How can I use C programming examples for learning?

     Start with simple examples like Hello World and gradually progress to more complex ones. Analyze the code, understand how each line works, and expe...
   • Can I modify the examples to create my programs?

     Absolutely! Modifying existing examples is an excellent way to practice. Experiment with changing variables, adding features, or solving similar pr...

6. stackoverflow.com › questions › 78461149compiler errors - what is the reason for this in C language ...

   stackoverflow.com › questions › 78461149

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   1 day ago · 0. Click here to see the code. I ran this code in my compiler and got the output : x = 0 y = -1 z = 0. but according to chat gpt the output is : x = 0 y = 0 z = 0. What can be the reason for this ?

7. socialsci.libretexts.org › Courses › Canada_College6.5: Why not the dictionary? - Social Sci LibreTexts

   socialsci.libretexts.org › Courses › Canada_College

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   3 days ago · Generally, there is a common myth that dictionaries are the ultimate authority of language. In arguments, perhaps you have heard people say things like “The dictionary defines X as…” or “That’s not a word because it’s not in the dictionary.”. Let’s think about why this type of argumentation is flawed.

8. www.techgeekbuzz.com › blog › online-c-compilersTop 10 Online C Compilers to Write and Compile Code Faster

   www.techgeekbuzz.com › blog › online-c-compilers

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   4 days ago · 6. Godbolt. Godbolt is one of the most advanced C compilers on the web. It comes loaded with several features like color-coding, a built-in debugger, and options for downloading source code. However, writing and running C code with the Godbolt compiler is a bit complex compared to other online compilers on this list.

9. en.wikipedia.org › wiki › C++C++ - Wikipedia

   en.wikipedia.org › wiki › C++

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   1 day ago · C++ Programming at Wikibooks. C++ ( / ˈsiː plʌs plʌs /, pronounced " C plus plus " and sometimes abbreviated as CPP) is a high-level, general-purpose programming language created by Danish computer scientist Bjarne Stroustrup.