double getAverage(int arr[], int size)
{
 int  i;
 double avg;
 double sum;

 for (i = 0; i < size; ++i)
 {
  sum += arr[i];
 }

 avg = sum / size;

 return avg;
}

 #include <stdio.h>
 
/* function declaration */
double getAverage(int arr[], int size);

int main ()
{
  /* an int array with 5 elements */
  int balance[5] = {1000, 2, 3, 17, 50};
  double avg;

  /* pass yiibaier to the array as an argument */
  avg = getAverage( balance, 5 ) ;
 
  /* output the returned value */
  printf( "Average value is: %f ", avg );
  
  return 0;
}

Average value is: 214.400000

#include <stdio.h>

/* function to generate and return random numbers */
int * getRandom( )
{
 static int r[10];
 int i;

 /* set the seed */
 srand( (unsigned)time( NULL ) );
 for ( i = 0; i < 10; ++i)
 {
   r[i] = rand();
   printf( "r[%d] = %d
", i, r[i]);

 }

 return r;
}

/* main function to call above defined function */
int main ()
{
  /* a yiibaier to an int */
  int *p;
  int i;

  p = getRandom();
  for ( i = 0; i < 10; i++ )
  {
    printf( "*(p + %d) : %d
", i, *(p + i));
  }

  return 0;
}

r[0] = 313959809
r[1] = 1759055877
r[2] = 1113101911
r[3] = 2133832223
r[4] = 2073354073
r[5] = 167288147
r[6] = 1827471542
r[7] = 834791014
r[8] = 1901409888
r[9] = 1990469526
*(p + 0) : 313959809
*(p + 1) : 1759055877
*(p + 2) : 1113101911
*(p + 3) : 2133832223
*(p + 4) : 2073354073
*(p + 5) : 167288147
*(p + 6) : 1827471542
*(p + 7) : 834791014
*(p + 8) : 1901409888
*(p + 9) : 1990469526