By clicking Post Your Answer, you agree to our terms of service, privacy policy and cookie policy. By clicking Accept all cookies, you agree Stack Exchange can store cookies on your device and disclose information in accordance with our Cookie Policy. Which was the first Sci-Fi story to predict obnoxious "robo calls"? Site design / logo 2023 Stack Exchange Inc; user contributions licensed under CC BY-SA. Content Discovery initiative April 13 update: Related questions using a Review our technical responses for the 2023 Developer Survey, Output changes when I put my code into a function. rev2023.5.1.43405. how to make this function return a string. How to initialize all members of an array to the same value? In modern C++ a better approach is to return a standard library container like std::vector, instead of raw pointers. Generally, answers are much more helpful if they include an explanation of what the code is intended to do, and why that solves the problem without introducing others. Returning an array from function is not as straight as passing array to function. Do: To learn more, see our tips on writing great answers. First off, if you're using C++, use std::string to represent strings. So mychar () and mycharstack () both return a pointer to a string literal stored in read-only memory. Or use a std::vector in C++. Another one is to use dynamic pointers whenever possible (and strdup() string literals), so last pointer "user" will always free it. What are the advantages of running a power tool on 240 V vs 120 V? Connect and share knowledge within a single location that is structured and easy to search. Probably not a bad idea - edited. rev2023.5.1.43404. I'm Trying to do some simple c programming that will return the char value. Could a subterranean river or aquifer generate enough continuous momentum to power a waterwheel for the purpose of producing electricity? To subscribe to this RSS feed, copy and paste this URL into your RSS reader. A string literal refers to an array that lives in static memory. By clicking Post Your Answer, you agree to our terms of service, privacy policy and cookie policy. a NULL) at the end. By clicking Post Your Answer, you agree to our terms of service, privacy policy and cookie policy. Assuming you are processing, drop the const. (And you probably should be compiling with. The marked dupe has an accepted (and highly upvoted) answer, that explains the problem (exactly the same the OP asks for) in depth. var prevPostLink = "/2017/10/multi-dimensional-array-c-declare-initialize-access.html"; 565), Improving the copy in the close modal and post notices - 2023 edition, New blog post from our CEO Prashanth: Community is the future of AI. Why is processing a sorted array faster than processing an unsorted array? Find centralized, trusted content and collaborate around the technologies you use most. Interpreting non-statistically significant results: Do we have "no evidence" or "insufficient evidence" to reject the null? Browse other questions tagged, Where developers & technologists share private knowledge with coworkers, Reach developers & technologists worldwide, Returning the pointer? Is there a way to use pointers correctly instead of having to change my array and add struct types? Many thanks for this, its obviously very fundamental but something I've been doing wrong for a while. Not the answer you're looking for? Are there any canonical examples of the Prime Directive being broken that aren't shown on screen? How to define a C-string? It is not possible to return an array from a C++ function. Can I use an 11 watt LED bulb in a lamp rated for 8.6 watts maximum? Use malloc to allocate sub_str, and return char**. The declaration of strcat() returns a pointer to char (char *). error:return from incompatible pointer type. Is it safe to publish research papers in cooperation with Russian academics? Canadian of Polish descent travel to Poland with Canadian passport. How to convert a std::string to const char* or char*. If we had a video livestream of a clock being sent to Mars, what would we see? How does it work correctly? Fair enough then :), C++ How to return dynamically allocated array from function, How a top-ranked engineering school reimagined CS curriculum (Ep. You can use static instead of malloc. You can't return C arrays as such, just a char **. I guess the string stored in mychar() is also on stack. Not the answer you're looking for? Two MacBook Pro with same model number (A1286) but different year. The reason that the first is preferred is because it re-enforces proper disposal of allocated memory. What differentiates living as mere roommates from living in a marriage-like relationship? Asking for help, clarification, or responding to other answers. @mydaemon well I can't write all the code of the entire program, it is clear that the OP has to free the memory after its usage. Further applying [0] on that character is ill-formed since there is no subscript operator for arguments char and int. From the linked FAQ "Arrays are not pointers, though they are closely related (see question 6.3) and can be used similarly." Big applications can have hundreds of functions. Why is processing a sorted array faster than processing an unsorted array? Also gcc warns me that I'm trying to return integer without a cast when I return the array from above. While this solves the current problem, it doesn't explain the issues of using arrays of other types. What design pattern to use for collection of items? 565), Improving the copy in the close modal and post notices - 2023 edition, New blog post from our CEO Prashanth: Community is the future of AI. Thank you. To subscribe to this RSS feed, copy and paste this URL into your RSS reader. I tried using pointers from an example I read, but it gives me: cannot convert 'const char*[3][2] to int* in assignement. To keep everyone but the zealots happy, you would do something a little more elaborate: Just remember to free the allocated memory when you are done, cuz nobody will do it for you. Site design / logo 2023 Stack Exchange Inc; user contributions licensed under CC BY-SA. This can be done by taking a reference parameter, through which you assign one of the values: Or, you could return a std::pair containing both values: But both of these are crazy bad ideas, so you could start right now to write actual C++ so it doesn't look like deformed C, using standard containers: Simple, leak-proof and exception-safe (well, ideally you'd sanitize user input too). Pass arrays to a function in C In this tutorial, you'll learn to pass arrays (both one-dimensional and multidimensional arrays) to a function in C programming with the help of examples.

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