Function that return array in C

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I have a function, and I know how to print and change every element, how I can return array in index without print? Or create one more function only for return arr, for example [3]

What I have tried:

void a(int arr[], int arr_el, int i)
{
printf(“%d\n”, arr[i]);
}

int main(){
int arr[3] = {24, 6, 18};
int arr_el=3;
int i;
a();

Posted 19-Dec-22 9:55am

Member 15858418

Updated 20-Dec-22 12:53pm

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OriginalGriff · Answer 1 · 2022-12-19T10:36:00

Try:

C

int* returnArray(int arr[])
   {
   ...
   return arr;
   }
   
int main()
{
    printf("Hello World\n");
    int a[3] = {1, 3, 5};
    int *b = returnArray(a);
    printf("%d\n", b[1]);
    return 0;
}

An array and a pointer are very similar: the name of an array is a pointer to the first element (according to the language definition).
So if you have an array, you can treat it like a pointer, and vice versa

CPallini · Answer 2 · 2022-12-19T10:37:00

Returning just one item of an array is pretty straightfoward, e.g.

C++

#include <stdio.h>                                                                                                     #include <stdlib.h>                                                                                                                                                                                                                             int get_item( int a[], size_t size, size_t index)                                                                       {                                                                                                                         
  if ( index < size )                                                                                                       
    return a[index];                                                                                                      
  else                                                                                                                      
    return 0; // there is actually no meaningful way to signal the error                                                          }                                                                                                                                                                                                                                               
int main()                                                                                                              {                                                                                                                         
  int arr[] = {1, 42, -12};                                                                                               
  printf("arr[%u] = %d\n", 1, get_item(arr, 3, 1));                                                                       
  return 0;                                                                                                             }

KarstenK · Answer 3 · 2022-12-19T21:25:00

Solution 3

You can return an array in this way:

C++

int* getArray() {
  int *array = malloc( 5 * sizeof(int));
  // do stuff with that array
  return array
}

important: the returned array needs memory managment so use free, when done. Read about new and free.

Remark: C++ has built-in arrays like vector.

Posted 19-Dec-22 21:25pm

KarstenK

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Member 15858418 20-Dec-22 4:12am

Thanks

Function that return array in C

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