Greetings Im having trouble with my appstore programming ass

Greetings,

I\'m having trouble with my appstore programming assignment in C. I\'m trying to create appstore program . here is the caviar, i cannot declare the pointers at beginning of the main function. however, i have to you pointers inside the prototype functions or inside the parameters. I\'m having trouble in having the program recognize the pointers inside the prototypes. here is my code. Please help!!

#include<stdio.h>

#define _CRT_SECURE_NO_WARNINGS

// Displays the list of apps available
//prompts for the user’s selection and sets the value of the selection
void AppMenu(char *appChoicePtr);

//sets the cost of the item based on value stored in purchase
void GetCost(char appChoice, double *appCostPtr);

//Displays the codes for money input- gets user input amounts
//compares the int codes and updates the deposit amount
void MoneyMenu(double *BalancePtr, double appCost);

//compares the amount the user has in deposits to the price of item selected.
//It returns 1 if the amount is enough to cover the cost, 0 if there is not enough.
int Enough(double balance, double appCost);

//uses MoneyMenu function to display and collect dollar amounts from the user
//uses CheckMoney function to keep comparing the added deposited amount to the item cost.
void GetMoney(double *balancePtr, double appCost);

//calculates the amount of leftover from your deposits
void GetChange(double *balancePtr, double appCost);

//Asks the user if they want another app
void Again(char *quitPtr);

int main()
{
   char quit;
   char appChoice = \' \';
   double appCost;
   double balance = 0;
   printf(\"###### Welcome to the App Store ######\");

   //call Quit
   Again(&quit);
   //initialize while loop
   do{
       printf(\"\ \ -----------------------------------\");
       //call menu
       AppMenu(&appChoicePtr);
       printf(\"You selected: %c\", appChoicePtr);
       //call getcost
       GetCost(appChoice, &appCostPtr);
       printf(\"\ That item costs $%.2f\", appCostPtr);
       //call getmoney
       GetMoney(&balancePtr, appCost);
       printf(\"\ Your current balance is $%.2f\", balancePtr);
       //call getchange
       GetChange(&balancePtr, appCost);
       Again(&quit);

   } while (quit != \'N\'&&quit != \'n\');
   //end while loop
   printf(\"\ \ Thank You!, Good Bye\ \");
   return 0;
}
void AppMenu(char *appChoicePtr)
{
   printf(\"\ \ _____PLEASE MAKE A SELECTION_____\ \ \");
   printf(\" \ G -- Graphic Calculator $14.95\");
   printf(\" \ M -- Music Downloader $2.95\");
   printf(\" \ C -- C programming guide $7.95\");
   printf(\" \ T -- TxtToVoice $4.95\");
   printf(\" \ A -- Astronomy Guide $5.95\ \ >>>\");
   scanf_s(\" %c\", appChoicePtr);
}
void MoneyMenu(double *BalancePtr, double appCost)
{
   int input = 1;
   printf(\"\ Please credit your money by making a selection:\ -- 20 $20.00\ -- 10 $10.00\ --- 5 $5.00\ --- 1 $1.00\ \ Deposit Selection: \");
   scanf_s(\" %d\", &input);
   printf(\"\ You have entered: %d\", input);
   //display money choices
   if (input == 20)
   {
       *BalancePtr += 20.0;
   }
   else if (input == 10)
   {
       *BalancePtr += 10.0;
   }
   else if (input == 5)
   {
       *BalancePtr += 5.0;
   }
   else if (input == 1)
   {
       *BalancePtr += 1.0;
   }
}
void GetCost(char appChoice, double *appCostPtr)
{
   //condition to update the selection made by the user
   if (appChoice == \'M\' || appChoice == \'m\')
   {
       *appCostPtr = 2.95;
   }
   else if (appChoice == \'G\' || appChoice == \'g\')
   {
       *appCostPtr = 14.95;
   }
   else if (appChoice == \'C\' || appChoice == \'c\')
   {
       *appCostPtr = 7.95;
   }
   else if (appChoice == \'T\' || appChoice == \'t\')
   {
       *appCostPtr = 4.95;
   }
   else if (appChoice == \'A\' || appChoice == \'a\')
   {
       *appCostPtr = 5.95;
   }
}
void GetMoney(double *balancePtr, double appCost)
{
   // call money menu
   MoneyMenu(*BalancePtr, appCost);
   //call check money
   CheckMoney(*deposits, item_cost);
}
int Enough(double balance, double appCost)
{
   //condition to check if money is enough to cover purchase
   if (balance >= appCost)
   {
       return 1;
   }
   else if (balance<appCost)
   {
       printf(\"\ Insufficient funds, you need to add more money\");
       return balance;
   }
}
void GetChange(double *balancePtr, double appCost)
{
   double change = 0;

   //calculate change left over from transaction
   change = *balancePtr - appCost;
   printf(\"\ You have...$%.2f\", change);
}

void Again(char *quitPtr)
{
   printf(\"\ \ Would you like to buy an app Y/N?: \");
   scanf(\" %c\", *quitPtr);
}

Solution

Hi,

You need to assign variables inside the main function,and then using (&) assign the address of the variable.I compiled your code and fix the bugs , Wherever required inside main function.

Like, you have to declare local variables ex:

char q;
double d;
double b;

AppMenu(&q);// Like this you should call your Appmenu Method,
printf(\"You selected: %c\", &q);
//call getcost
GetCost(appChoice, &d);

GetCost(appChoice, &d); Call Getcost function Like this
printf(\"\ That item costs $%.2f\", d);
//call getmoney
GetMoney(&b, appCost);//Call getMoney Function like this
printf(\"\ Your current balance is $%.2f\", b);

int main()
{
char quit;
char appChoice = \' \';
double appCost;
double balance = 0;
char q;
double d;
double b;
printf(\"###### Welcome to the App Store ######\");

//call Quit
Again(&quit);
//initialize while loop
do{
  
printf(\"\ \ -----------------------------------\");
//call menu
AppMenu(&q);
printf(\"You selected: %c\", &q);
//call getcost
GetCost(appChoice, &d);
printf(\"\ That item costs $%.2f\", d);
//call getmoney
GetMoney(&b, appCost);
printf(\"\ Your current balance is $%.2f\", b);
//call getchange
GetChange(&b, appCost);
Again(&quit);
} while (quit != \'N\'&&quit != \'n\');
//end while loop
printf(\"\ \ Thank You!, Good Bye\ \");
return 0;
}
void AppMenu(char *appChoicePtr)
{
printf(\"\ \ _____PLEASE MAKE A SELECTION_____\ \ \");
printf(\" \ G -- Graphic Calculator $14.95\");
printf(\" \ M -- Music Downloader $2.95\");
printf(\" \ C -- C programming guide $7.95\");
printf(\" \ T -- TxtToVoice $4.95\");
printf(\" \ A -- Astronomy Guide $5.95\ \ >>>\");
scanf_s(\" %c\", appChoicePtr);
}
void MoneyMenu(double *BalancePtr, double appCost)
{
int input = 1;
printf(\"\ Please credit your money by making a selection:\ -- 20 $20.00\ -- 10 $10.00\ --- 5 $5.00\ --- 1 $1.00\ \ Deposit Selection: \");
scanf_s(\" %d\", &input);
printf(\"\ You have entered: %d\", input);
//display money choices
if (input == 20)
{
*BalancePtr += 20.0;
}
else if (input == 10)
{
*BalancePtr += 10.0;
}
else if (input == 5)
{
*BalancePtr += 5.0;
}
else if (input == 1)
{
*BalancePtr += 1.0;
}
}
void GetCost(char appChoice, double *appCostPtr)
{
//condition to update the selection made by the user
if (appChoice == \'M\' || appChoice == \'m\')
{
*appCostPtr = 2.95;
}
else if (appChoice == \'G\' || appChoice == \'g\')
{
*appCostPtr = 14.95;
}
else if (appChoice == \'C\' || appChoice == \'c\')
{
*appCostPtr = 7.95;
}
else if (appChoice == \'T\' || appChoice == \'t\')
{
*appCostPtr = 4.95;
}
else if (appChoice == \'A\' || appChoice == \'a\')
{
*appCostPtr = 5.95;
}
}
void GetMoney(double *balancePtr, double appCost)
{
// call money menu
MoneyMenu(*balancePtr, appCost);
//call check money
CheckMoney(*deposits, item_cost);
}
int Enough(double balance, double appCost)
{
//condition to check if money is enough to cover purchase
if (balance >= appCost)
{
return 1;
}
else if (balance<appCost)
{
printf(\"\ Insufficient funds, you need to add more money\");
return balance;
}
}
void GetChange(double *balancePtr, double appCost)
{
double change = 0;
//calculate change left over from transaction
change = *balancePtr - appCost;
printf(\"\ You have...$%.2f\", change);
}
void Again(char *quitPtr)
{
printf(\"\ \ Would you like to buy an app Y/N?: \");
scanf(\" %c\", *quitPtr);
}