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. 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.
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. The question was not if it is possible to return a pointer to an array. It certainly can't the on the stack in the stack frame of returnArray right? Yes, this is answer to my question: Can C function return an array? Yes it can, and Indinfer has answer it with the use of C own struc data type. And of course it should be of fixed length array. An array is a type of data structure that stores a fixed-size of a homogeneous collection of data.
In short, we can say that array is a collection of variables of the same type. For example, if we want to declare 'n' number of variables, n1, n In such a case, we create an array of variables having the same type. 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. Please mail your requirement at [email protected] Duration: 1 week to 2 week. We have made the function call. As the array is returned, we add a pointer integer type variable to accept the value. The values that were stored in the array are printed manually. The output is obtained through the compilation and execution method.
Structures are the containers like arrays. But array contains the value of the same data type at a time. And in the case of structures, they contain more than one data type value.
Here, the array declaration is inside the structures instead of functions. The return type is the name of the structure. The structure variable is returned to the main program. After the structure declaration, we have used a function in which an object of structure is created.
This object will be used to access the structure. This function will return the object of structure to the main function so that we can print the array through this object. A variable will get the values in the variable. This value is the integer number up to which we will enter values in the array. As in this example, we have selected 6 as the number. So, the numbers will be entered up to 6 in the array. Now, moving towards the main program, we have created an object to access the array through this:.
After object initialization, a value is added to the variable up to which we want the numbers to be entered in the array. In a function call, we will pass the value in the parameter:. We will have the display by using the for loop. The values are displayed through the object declared at the start of the main program:. The output indicates that 6 values are shown in the result as we have entered 6 numbers in the program.
One of them is through std::array. It is a template of structure. This feature also provides two more functions that are size and empty.
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