// Workshop 1:
// Version: 1.0
// Date: 2021/05/21
// Author: Fardad Soleimanloo
// Description:
// w1p1.cpp
//
///////////////////////////////////////////////////
#define _CRT_SECURE_NO_WARNINGS
#include
#include
#include
// set to false when compling on Linux
const bool APP_OS_WINDOWS = false;
using namespace std;
void flushkeys();
bool ValidYesResponse(char ch);
bool yes();
void readCstr(char cstr[], int len);
int readInt(int min, int max);
const char* const SHOPPING_DATA_FILE = “shoppinglist.csv”;
FILE* sfptr = nullptr;
const int MAX_TITLE_LENGTH = 50;
const int MAX_QUANTITY_VALUE = 50;
struct ShoppingRec {
char m_title[MAX_TITLE_LENGTH + 1];
int m_quantity;
bool m_bought;
};
const int MAX_NO_OF_RECS = 15;
ShoppingRec recs[MAX_NO_OF_RECS] = {};
int noOfRecs = 0;
ShoppingRec getShoppingRec();
void displayShoppingRec(const ShoppingRec* shp);
void toggleBoughtFlag(ShoppingRec* rec);
bool isShoppingRecEmpty(const ShoppingRec* shp);
bool openFileForRead();
bool openFileForOverwrite();
void closeFile();
bool freadShoppingRec(ShoppingRec* rec);
void fwriteShoppintRec(const ShoppingRec* rec);
bool loadList();
void displayList();
void removeBoughtItems();
void removeItem(int index);
bool saveList();
void clearList();
void toggleBought();
void addItemToList();
void removeItemfromList();
bool listIsEmpty();
int listMenu();
int main() {
bool done = false;
loadList();
while (!done) {
system(APP_OS_WINDOWS ? “cls” : “clear”);
switch (listMenu()) {
case 1:
toggleBought();
break;
case 2:
addItemToList();
break;
case 3:
removeItemfromList();
break;
case 4:
removeBoughtItems();
break;
case 5:
clearList();
break;
default:
done = true;
}
}
saveList();
return 0;
}
int listMenu() {
cout << "-->>> My Shopping List <<<--" << endl;
displayList();
cout << "----------------------------" << endl
<< "1- Toggle bought Item" << endl
<< "2- Add Shopping Item" << endl
<< "3- Remove Shopping Item" << endl
<< "4- Remove bought Items" << endl
<< "5- Clear List" << endl
<< "0- Exit" << endl << "> “;
return readInt(0, 5);
}
void flushkeys() {
while (cin.get() != ‘\n’);
}
bool ValidYesResponse(char ch) {
return ch == ‘Y’ || ch == ‘y’ || ch == ‘N’ || ch == ‘n’;
}
bool yes() {
char ch = 0;
do {
cin >> ch;
flushkeys();
} while (!ValidYesResponse(ch) && cout << "Only (Y/y) or (N/n) is acceptable: ");
return ch == 'y' || ch == 'Y';
}
void readCstr(char cstr[], int len) {
char buf[1024] = {};
int i;
cin.getline(buf, 1024);
for (i = 0; i < len && buf[i]; i++) {
cstr[i] = buf[i];
}
cstr[i] = 0;
}
int readInt(int min, int max) {
int value = 0;
bool done = false;
while (!done) {
cin >> value;
if (!cin) {
cin.clear();
cout << "Bad integer, try agian: ";
}
else {
if (value >= min && value <= max) {
done = true;
}
else {
cout << "Value out of range (" << min << "<=value<=" << max << "): ";
}
}
flushkeys();
}
return value;
}
ShoppingRec getShoppingRec() {
ShoppingRec R = {};
cout << "Item name: ";
readCstr(R.m_title, MAX_TITLE_LENGTH);
cout << "Quantity: ";
R.m_quantity = readInt(1, MAX_QUANTITY_VALUE);
return R;
}
void displayShoppingRec(const ShoppingRec* shp) {
cout << "[" << (shp->m_bought ? ‘X’ : ‘ ‘) << "]" << shp->m_title <<
" qty:(" << shp->m_quantity << ")" << endl;
}
void toggleBoughtFlag(ShoppingRec* rec) {
rec->m_bought = !rec->m_bought;
}
bool isShoppingRecEmpty(const ShoppingRec* shp) {
return shp->m_title[0] == 0;
}
bool loadList() {
ShoppingRec shpr = {};
bool ok = false;
if (openFileForRead()) {
ok = true;
while (noOfRecs < MAX_NO_OF_RECS &&
freadShoppingRec(&shpr)) {
recs[noOfRecs++] = shpr;
}
closeFile();
}
return ok;
}
bool saveList() {
bool ok = false;
if (openFileForOverwrite()) {
ok = true;
for (int i = 0; i < noOfRecs; i++) {
fwriteShoppintRec(&recs[i]);
}
closeFile();
}
return ok;
}
void removeItem(int index) {
if (index >= 0 && index < noOfRecs) {
noOfRecs--;
for (int i = index; i < noOfRecs; i++) {
recs[i] = recs[i + 1];
}
}
}
void clearList() {
cout << "This will remove all the items from the list;" << endl
<< "Are you sure? (Y)es/(N)o" << endl;
if (yes()) {
noOfRecs = 0;
}
else {
cout << "Cancelled!" << endl;
}
}
void toggleBought() {
cout << "Item number: ";
toggleBoughtFlag(&recs[readInt(1, noOfRecs) - 1]);
}
void addItemToList() {
if (noOfRecs < MAX_NO_OF_RECS) {
recs[noOfRecs] = getShoppingRec();
noOfRecs += !isShoppingRecEmpty(&recs[noOfRecs]);
}
else {
cout << "Shopping List is full!" << endl;
}
}
void removeItemfromList() {
if (!listIsEmpty()) {
int value = 0;
cout << "Item number to delete: ";
value = readInt(1, noOfRecs);
cout << "Deleting following item, are you sure?" << endl;
displayShoppingRec(&recs[value - 1]);
cout << "(Y)es/(N)o: ";
if (yes()) {
removeItem(value - 1);
}
else {
cout << "Cancelled!" << endl;
}
}
else {
cout << "List is empty!" << endl;
}
}
bool listIsEmpty() {
return noOfRecs == 0;
}
void displayList() {
for (int i = 0; i < noOfRecs; i++) {
cout << (i + 1) << "-";
displayShoppingRec(&recs[i]);
}
}
void removeBoughtItems() {
if (!listIsEmpty()) {
cout << "Removing bought items, are you sure?" << endl;
cout << "(Y)es/(N)o: ";
if (yes()) {
for (int i = 0; i < noOfRecs; i++) {
if (recs[i].m_bought) removeItem(i--);
}
}
else {
cout << "Cancelled!" << endl;
}
}
else {
cout << "List is empty!" << endl;
}
}
bool openFileForRead() {
sfptr = fopen(SHOPPING_DATA_FILE, "r");
return sfptr != NULL;
}
bool openFileForOverwrite() {
sfptr = fopen(SHOPPING_DATA_FILE, "w");
return sfptr != NULL;
}
void closeFile() {
if (sfptr) fclose(sfptr);
}
bool freadShoppingRec(ShoppingRec* rec) {
int flag = 0;
bool success = fscanf(sfptr, "%[^,],%d,%d\n",
rec->m_title, &rec->m_quantity, &flag) == 3;
rec->m_bought = !!flag;
return success;
}
void fwriteShoppintRec(const ShoppingRec* rec) {
fprintf(sfptr, “%s,%d,%d\n”, rec->m_title, rec->m_quantity, rec->m_bought);
}