int function(void) { return; } Add a return value, or change the return type to void. Return has value, in function returning void错误. . So a function either can take some arguments, or nothing is taken. Can someone identify this school of thought? (b)A function in C should have at least one argument. Warning 'return' with no value, in function returning non-void - What should it return? The return statement Notes. Provide an answer or move on to the next question. This content, along with any associated source code and files, is licensed under The Code Project Open License (CPOL). For example: it happens when you have no return statement for a function who is returning a non-void value. When a return statement contains an expression in functions that have a void return type, the compiler generates a warning, and the expression isn't evaluated. Whenever you are not declaring any function with void(null) return value. One possible result is seeming to work, which is pretty much what you're seeing here. You need to redefine A,B,C,D and E to be character arrays, i.e. Returning by value as a const becomes important when you’re dealing with user-defined types. Below is the basic syntax of what you should be returning when writing your main block. Improve INSERT-per-second performance of SQLite, Xcode warning: “Multiple build commands for output file”. 20 Bay Street, 11th Floor Toronto, Ontario, Canada M5J 2N8 To resolve this warning, explicitly declare the return type of functions. We can return value of a local variable but it is illegal to return memory location that is allocated within function on stack. If a question is poorly phrased then either ask for clarification, ignore it, or. Inside the function, the line "return X;" must be found, where X is a value or variable containing a value of the given type. spelling and grammar. The return statement returns the flow of the execution to the function from where it is called. x), or expressions (e.g. The message also tells you that if the function returns 'void', it would not give the warning. site design / logo © 2021 Stack Exchange Inc; user contributions licensed under cc by-sa. Return true/false function function always returns true. (a)C functions can return only one value under their function name. , you should always specify a valid return type you expext as the o/p. How does one defend against supply chain attacks? See C++ Core Guidelines I.11. But be careful if you try to do this: You do not want to return a reference to a local variable within a function — because when the function ends, the storage space for the local variables goes away. How to develop a musical ear when you can't seem to get in the game? Prerequisite : Functions in C/C++ A function in C can be called either with arguments or without arguments. Returning multiple values using an array (Works only when returned items are of same types): When an array is passed as an argument then its base address is passed to the function so whatever changes made to the copy of the array, it is changed in the original array. :-P Seriously, if a function has a return type, don't just. Pre-requisite: Functions in C/C++. Is it kidnapping if I steal a car that happens to have a baby in it? . But because the function is supposed to return a value but your 'return' statement didn't, you have a problem. Trying to use the return value from the function will most likely cause a segmentation fault. Every C function must specify the type of data that is being generated. The return statement may or may not return anything for a void … Messages: 39 Likes Received: 1 Best Answers: 0 Trophy Points: 63 #2. replace main with void main() ... yaa a function should return a value.. and when it doesn't, its return type is void Rising_Star, Sep 22, 2011. This style of code elicits the warning you got - and C99 officially outlaws it, but compilers continue to accept it for reasons of backwards compatibility. To do so, you would have to declare a function returning a pointer as in the following example − int * myFunction() { . I doubt you will get any further warnings, This Put a Return statement at the point where the procedure's task is completed.. will be used. "Well, stop doing it, then!" How do I address unchecked cast warnings? As with pass by value, you can return by value literals (e.g. function return value in c, function with return value in c++ If you have a C++ program missing a return statement from a function that is supposed to return a value, g++ will compile it happily with no errors (or even a warning, unless -Wreturn-type or -Wall is used). If a function returns a class object by value as a const, the return value of that function cannot be an lvalue (that is, it cannot be assigned to or otherwise modified). First, if a function has a non-void return type, it must return a value of that type (using a return statement). (c)A function can be defined and placed before the main function (d)A user-defined function must be called at least once; otherwise a warning message (e)The return type of a function “ float ” by default. So we can categorize them into four types. Functions that return values can have that value stored in a variable, as shown in Line 11 of A Function That Returns a Value, or you can also use the value immediately. In this case, C4430 should also fire and the compiler implements the fix reported by C4430 (default value is int). your coworkers to find and share information. By John Paul Mueller, Jeff Cogswell . That is plagiarism and is not tolerated here. This was correctly answered four years ago, as shown in Solution 1 above. The correct version is: Obviously your code is more complicated, but it should be fairly easy to spot a bare return in your code. Asking for help, clarification, or responding to other answers. Powerful tail swipe with as little muscle as possible. Better user experience while having a small amount of content to show. Add a return value, or change the return type to void. Why does flowing off the end of a non-void function without returning a value not produce a compiler error? Exercise 1: Type the source code from A Function That Returns a Value into your editor. If you try to return more than one values from a function, only one value will be returned that appears at the right most place of the return statement. jantseo, Sep 22, 2011. rev 2021.1.20.38359, Sorry, we no longer support Internet Explorer, Stack Overflow works best with JavaScript enabled, Where developers & technologists share private knowledge with coworkers, Programming & related technical career opportunities, Recruit tech talent & build your employer brand, Reach developers & technologists worldwide, "Doctor, it hurts when I rub here!" 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