Function C Tutorial

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#include 
long *myFunction(long* pPay);          
int main(void)
{
  long your_pay = 30000L;             
  long *pold_pay = &your_pay;         
  long *pnew_pay = NULL;              
  pnew_pay = myFunction( pold_pay );
  printf("\nOld pay = $%ld", *pold_pay);
  printf("   New pay = $%ld\n", *pnew_pay);
  return 0;
}
long *myFunction(long *pPay)
{
  *pPay += 10000L;                    
  return pPay;                        
}
Old pay = $40000 New pay = $40000