CS201 Assignment No 3 With Solution 2021

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CS201 Assignment No -3 Solution 

#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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