choice = menu();


    // Execute the appropriate choice.
    if (choice == 1) {
        dobuy(&cash, &numchips);
    }
    else if (choice == 2) {
        dosell(&cash, &numchips);
    }`

void dosell(int *cash, int *numchips) {

   int numsell;

   // Determine the number of chips to be sold.
   printf("How many chips do you want to sell?n");
   scanf("%d", &numsell);

   // Print out the error message if this is too much.
   if (numsell > *numchips)
       printf("Sorry, you do not have that many chips. No chips sold.n");

   // Execute the transaction.
    else {
       (*cash) += sellchips(numsell);
       (*numchips) -= numsell;
}}}