In this example you must use static keyword in array definition to set to application-long the array lifetime, so it will not destroyed after return statement. Of course, in this way you occupy SIZE bytes in your memory for the entire application life, so size it properly! In your case, you are creating an array on the stack and once you leave the function scope, the array will be deallocated.
Instead, create a dynamically allocated array and return a pointer to it. Your method will return a local stack variable that will fail badly. To return an array, create one outside the function, pass it by address into the function, then modify it, or create an array on the heap and return that variable.
Both will work, but the first doesn't require any dynamic memory allocation to get it working correctly. There are other options. A routine might return a pointer to an array or portion of an array that is part of some existing structure. The caller might pass an array, and the routine merely writes into the array, rather than allocating space for a new array.
Stack Overflow for Teams — Collaborate and share knowledge with a private group. Create a free Team What is Teams? Collectives on Stack Overflow. Learn more. Returning an array using C Ask Question. Asked 9 years, 3 months ago. Active 3 years, 4 months ago. Viewed k times. Improve this question. Ashish Ahuja 4, 10 10 gold badges 49 49 silver badges 64 64 bronze badges.
Is the return array a known size as indicated in your code sample? Yes, I know the size of the incomming array at all times.
The size of the input and output array wont change. Add a comment. Active Oldest Votes. You can't return arrays from functions in C. Improve this answer. Option 3: a static array — moooeeeep. Option 4: Return a struct that contains a fixed-size array. Option 5: Return a union that contains a fixed-size array.
Show 14 more comments. John Bode John Bode k 17 17 gold badges silver badges bronze badges. Your link to "the development of C" has broken Kundor: What bar recieves is a pointer, not an array. JohnBode: You're right! For some reason I thought fixed-size arrays were passed on the stack.
I recall an occasion, many years ago, when I found that an array's size had to be specified in the parameter signature, but I must have been confused. Indinfer Indinfer 4 4 silver badges 4 4 bronze badges. Each element of an array can be accessed using an index of the element. In the above program, we have first created the array arr[] and then we pass this array to the function getarray.
The getarray function prints all the elements of the array arr[]. In the above code, we have passed the array to the function as a pointer. The function printarray prints the elements of an array. In the above program, getarray function returns a variable 'arr'. It returns a local variable, but it is an illegal memory location to be returned, which is allocated within a function in the stack. Since the program control comes back to the main function, and all the variables in a stack are freed.
Therefore, we can say that this program is returning memory location, which is already de-allocated, so the output of the program is a segmentation fault. Returning array by passing an array which is to be returned as a parameter to the function. In the above code, we have created the variable arr[] as static in getarray function, which is available throughout the program.
Therefore, the function getarray returns the actual memory location of the variable ' arr '. JavaTpoint offers too many high quality services. Mail us on [email protected] , to get more information about given services.
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Reinforcement Learning. R Programming. It is a template of structure. This feature also provides two more functions that are size and empty. An array name is returned that indicates that the whole array is returned to the main program.
In addition to the library, it contains all the functions of the array. Since we can return the whole array with the name of it, so in the declaration of a function, we will use the array as a return type. Data is entered in the array. After that, the array will be returned to the main program.
Moving towards the main function, an array variable will accept the array when the function is called. Again, for loop will be used for displaying array values.
We observe the output from the image displayed below. As we have used 10 sizes, 0 numbers will be entered. Hence, these are displayed:. This approach is a dynamically allocated array.
As in this case, there is no need to specify array size. Moving toward the function, where the return type is also an int vector and also contain a vector pointer as an argument in the parameter. The function will multiply the elements of the array by two through using the tmp. Then, return the tmp. An auto-type variable will accept the values of the array from the function. The array contains the items in it. In the aforementioned article, we have described the five most commonly used methods to explain the functionality of returning an array from the function.
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Arrays are specific containers that have values of the same data type. There are many approaches to describe this phenomenon. In this guide, some common methods are explained: Use Pointers to Return the Static Array When we use a normal array, there are chances of having some sort of abnormal results.
Struct sample func int n.
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