point of sale program

[supahnonymous]

please help me convert this POS c program with pointer and structure. Can someone please

void displayPOS();
void displayINVENTORY();
void addProduct();
void updateProduct();
void deleteProduct();
void searchProduct();
char sort();
void cannotFound();
void backUp();

char array[50][50];
char productarray[50][50];
char name ;
int id;
char desc;
int price;
int qty;
char item;
int total;
int cash;
int change;
int temp;
int result;
int b = 0, c = 0;
char backup [50][50];
int status = 0;
int stts = 0;
int lasttotal = 0;

int main() {

int choice;

printf("MAIN MENU\n");
printf("\n[1] POS");
printf("\n[2] INVENTORY");
printf("\n[3] EXIT");
printf("\nCHOICE: ");
scanf("%d",&choice);

if(choice==1)
{
displayPOS();
main();
}
if(choice==2)
{
displayINVENTORY();
main();
}
if(choice==3)
{
printf("\nProgram Dismissed!\n");
exit(0);
}
}
void displayPOS()
{

printf("\nPOS");
printf("\nEnter Customer Name: ");
scanf("%s",&name);
do
{
printf("Enter product ID: ");
scanf("%d",&id);
result = sort();
temp = productarray [result][0];
cannotFound();

if(id == temp && temp != 0)
{
printf("\nDescription: %c",productarray [result][1]);
printf("\nPrice: %d",productarray [result][2]);
printf("\nEnter Quantity: ");
scanf("%d",&qty);

total=productarray [result][2]*qty;
productarray [result][3] = productarray [result][3] - qty;

do
{
printf("\nShop Again? [Y/N]: ");
scanf("%s",&item);

switch(item)

{
case 'y':
lasttotal = lasttotal + total;
status = 0;
if(stts < 1)
{
stts = 0;
}
stts++;
break;
case 'n':
lasttotal = lasttotal + total;
printf("Total: %d ",lasttotal);

printf("\nEnter Cash: ");
scanf("%d",&cash);

change=cash-lasttotal;
printf("Customer Change is: %d",change);
lasttotal = 0;
backUp();
status = 0;
stts = 0;
break;
default:

printf("\nPlease Try Again Thank You!");
status++;
break;

}
}while(status != 0);
}else if(id != temp && temp == 0){
stts++;
if(stts > 3){
main();
}
}
}while(stts !=0);
}

void displayINVENTORY()
{
int choice2;

printf("\nINVENTORY\n");
printf("\n[1] Add Product");
printf("\n[2] Update Product");
printf("\n[3] Delete Product");
printf("\n[4] Search Product");
printf("\n[5] Cancel");
printf("\nEnter Choice: ");
scanf("%d",&choice2);

if(choice2==1)
{
addProduct();
displayINVENTORY();
}
if(choice2==2)
{
updateProduct();
displayINVENTORY();
}
if(choice2==3)
{
deleteProduct();
displayINVENTORY();
}
if(choice2==4)
{
searchProduct();
displayINVENTORY();
}
if(choice2==5)
{
printf("\n Canceled");
main();
}
else
{
printf("\nInvalid Choice\n");
displayINVENTORY();
}
}
void addProduct()
{

printf("\nADD PRODUCT\n");


printf("\nProduct ID: ");
scanf("%d",&id);
productarray [b][0] = id;

getchar();
printf("\nDescription: ");
scanf("%s",&desc);
productarray [b][1] = desc;

getchar();
printf("\nPrice: ");
scanf("%d",&price);
productarray [b][2] = price;

printf("\nQuantity: ");
scanf("%d",&qty);
productarray [b][3] = qty;

printf("\nPRODUCT ADDED TO INVENTORY\n\n");

backUp();

b++;
}
void updateProduct()
{

printf("\nEnter product ID: ");
scanf("%d",&id);
result = sort();
temp = productarray [result][0];
cannotFound();
if(id == temp){
printf("\nDescription: %c",productarray [result][1]);
printf("\nPrice: %d",productarray [result][2]);
printf("\nQuantity: %d",productarray [result][3]);
getchar();
printf("\nEnter new value\n");
printf("\nDescription: ");
scanf("%[^\n]s",&desc);
productarray [result][1] = desc;
getchar();
printf("\nPrice: ");
scanf("%d",&price);
productarray [result][2] = price;
printf("\nQuantity: ");
scanf("%d",&qty);
productarray [result][3] = qty;

printf("\nPRODUCT UPDATED!");

backUp();

}
}
void deleteProduct()
{
char yn;

printf("\nDELETE PRODUCT\n");

printf("\nEnter product ID: ");
scanf("%d",&id);
result = sort();
temp = productarray [result][0];
cannotFound();
if(id == temp){
productarray [result][0] = 0;
productarray [result][1] = 0;
productarray [result][2] = 0;
productarray [result][3] = 0;
printf("\nAre you sure? [Y/N]");
scanf("%s",&yn);
if(yn == 'n'){
for(int i =0; i < 4; i++){
productarray [result][i] = backup [result][i];
}
displayINVENTORY();
}else if(yn == 'y'){
}
backUp();
}
}
void searchProduct()
{

printf("\nSEARCH PRODUCT\n");
printf("Enter Product ID: ");
scanf("%d",&id);
result = sort();
temp = productarray [result][0];
cannotFound();
if(id == temp){
printf("\nDescription: %c",productarray [result][1]);
printf("\nPrice: %d",productarray [result][2]);
if(productarray [result][3] != 0){
printf("\nQuantity: %d",productarray [result][3]);
}else{
printf("\nQuantity: Out of Stack!");
}

backUp();

}
}

char sort()
{
temp = 0;
int count = 0;
for(int i = 0; i < 50; i++){
if(productarray [i][0] == id){
temp = productarray [i][0];
count = i;
}
}
return (char) count;
}

void cannotFound()
{
if( temp == 0){
printf("\nNo Match Found! \n");
}
}

void backUp()
{
for(int i = 0; i < 4; i++){

backup [result][i] = productarray [result][i];

}
}

[48bpfSEw]

What is wrong with this code? If it works : fine! Never touch a running system! ^^

I would not touch the code but write a "facade" arround it to use "string" and other classes of c++.

https://en.wikipedia.org/wiki/Facade_pattern

good luck!

[AbstractionAnon]

It's not clear if your objective is to leave this in C (adding structures and pointers) or rewrite it in C++.

If your objective is to rewrite this in C++, then you have several things you need to fix:
- Change printf to cout
- Change scanf to cin
- Eliminate the recursive calls to main().
- Create a class for products
In either case,
- Eliminate use of globals

PLEASE USE CODE TAGS (the <> formatting button) when posting code.
It makes it easier to read your code and also easier to respond to your post.
http://www.cplusplus.com/articles/jEywvCM9/
Hint: You can edit your post, highlight your code and press the <> formatting button.

Edit:
There are a number of things wrong with your program as it exists. Primarily, you're trying to store things like name, desc, price, qty into single characters.

[tipaye]

I take it you want an illustration of the use of data structures and pointers in C. From the code above, you've used for loop initial declarations (for (int i = 0;...){}) which is legal in C++, C99, etc., but not in C89, so I have to ask whether you have to use a specific version of C, or not? The choice of language dramatically affects how the code may be written.