CS201 Assignment No 3 Solution 2021
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CS201 Assignment No 3 Solution 2021
#include <iostream>
#include <stdio.h>
#include <string>
#include <fstream>
#include <sstream>
using namespace std;
class Inventory{
private:
int itemID;
char itemName[20];
float itemPrice;
float quantity;
float totalPrice;
public:
void readItem(){
cout<<"Please enter item id: ";
cin>>itemID;
cout<<"Please enter item name: ";
cin>>itemName;
cout<<"Please enter item price: ";
cin>>itemPrice;
cout<<"Please enter item quantity: ";
cin>>quantity;
totalPrice = itemPrice * quantity;
char inventory[] = "Inventory.txt";
fstream fs;
fs.open(inventory, ios::app);
if(!fs.is_open()){
cout<<"Error Opeingin File, try again!";
return;
}
fs<<"Item id:"<<itemID<<"\t Item name:"<<itemName;
fs<<"\t ItemPrice:"<<itemPrice<<"\t Quantity:"<<quantity;
fs<<"\t TotalPrice:"<<totalPrice<<"\n";
if(!fs.bad()){
cout<<"Inventory record(s) added successfully."<<endl;
}
fs.close();
}
void displyItem(){
fstream fs;
fs.open("Inventory.txt");
if(!fs.is_open()){
cout<<"ERROE IN OPENING FILE";
}
string line;
while ( getline (fs, line) ){
cout << line <<endl;
}
fs.close();
}
int getItemID(){
return itemID;
}
float getPrice(){
return itemPrice;
}
float getQuantity(){
return quantity;
}
void updateQuantity(float q){
quantity = q;
}
};
//Deleting existing file
void deleteExistingFile(){
fstream fs;
fs.open("Inventory.txt");
if(fs.is_open()){
fs.close();
remove("Inventory.txt");
}
}
//Appending item in file
void appendToFille(){
Inventory inv;
inv.readItem();
}
//Displaying items
void displayAll(){
Inventory inv;
inv.displyItem();
}
//Increasing Quantity of item
void increaseQuanity(){
int id;
float q;
Inventory inv;
cout<<"Enter item id:"<<endl;
cin>>id;
cout<<"Add quantity? ";
cin>>q;
inv.updateQuantity(q);
ifstream fs;
fs.open("Inventory.txt");
if(!fs.is_open()){
cout<<"ERROE IN OPENING FILE";
}
string line, targetId, newContent, Q, T;
int colonCount = 0, spaceCount = 0, preSpCount = 0;
int strToInt, nq, t, newQuantity;
bool found = false;
while(getline(fs, line)){
if(!found){
for(int i = 0; i < line.length(); i++){
if(line[i] == ':'){
colonCount++;
}
if(isspace(line[i])){
spaceCount++;
}
if(colonCount == 1 && spaceCount == 1 && line[i] != ':'){
targetId += line[i];
stringstream ss(targetId);
ss >> strToInt;
if(strToInt == id){
found = true;
}
}
if(colonCount == 5){
preSpCount = spaceCount;
}
if(found && colonCount == 4 && line[i] != ':' && spaceCount == 8){
Q += line[i];
if(isspace(line[i + 1]) || line[i + 1] == '\t' || line[i + 1] == '\0' || line[i + 1] == '\n'){
stringstream ss2(Q);
ss2 >> nq;
stringstream ss3;
newQuantity = nq + inv.getQuantity();
ss3 << newQuantity;
string temp;
ss3 >> temp;
newContent += temp;
}
}else if(found && colonCount == 5 && line[i] != ':' && preSpCount == spaceCount){
T += line[i];
if(isspace(line[i + 1]) || line[i + 1] == '\0' || line[i + 1] == '\n'){
stringstream ss4(T);
ss4 >> t;
int tempPrice = t / nq;
tempPrice *= newQuantity;
stringstream ss5;
ss5 << tempPrice;
string temp2;
ss5 >> temp2;
cout<<"if"<<tempPrice<<temp2;
newContent += temp2;
}
}else{
newContent += line[i];
}
}
}else{
newContent += line;
}
}
fs.close();
if(found){
ofstream of;
of.open("Inventory.txt", ios::trunc);
of << newContent;
of.close();
}
}
void showMenu(){
cout<<"ENTER CHOICE"<<endl;
cout<<"1. ADD AN INVENTORY ITEM"<<endl;
cout<<"2. DISPLAY FILE DATA"<<endl;
cout<<"3. INCREASE QUANTITY"<<endl;
cout<<"Please select a choice:";
}
int main(){
deleteExistingFile();
char useAgain;
do{
showMenu();
int ch;
cin>>ch;
switch(ch){
case 1:
appendToFille();
break;
case 2:
displayAll();
break;
case 3:
increaseQuanity();
break;
}
cout<<endl<<"Do you want to continue? : ";
cin>>useAgain;
}while(useAgain == 'y' || useAgain == 'Y');
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