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Added new DSA problem on factorial #378

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Added new DSA problem on factorial #378

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28 changes: 28 additions & 0 deletions .vscode/tasks.json
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Original file line number Diff line number Diff line change
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{
"tasks": [
{
"type": "cppbuild",
"label": "C/C++: g++.exe build active file",
"command": "C:\\msys64\\ucrt64\\bin\\g++.exe",
"args": [
"-fdiagnostics-color=always",
"-g",
"${file}",
"-o",
"${fileDirname}\\${fileBasenameNoExtension}.exe"
],
"options": {
"cwd": "${fileDirname}"
},
"problemMatcher": [
"$gcc"
],
"group": {
"kind": "build",
"isDefault": true
},
"detail": "Task generated by Debugger."
}
],
"version": "2.0.0"
}
262 changes: 131 additions & 131 deletions app.js
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Original file line number Diff line number Diff line change
@@ -1,132 +1,132 @@
const express = require('express');
const mongoose = require('mongoose');
const bcrypt = require('bcrypt');
const cors = require('cors');
// Import required modules
// Create an Express app
const app = express();
// Enable CORS
app.use(express.json());
app.use(cors());
// Connect to MongoDB
mongoose.connect('mongodb://localhost:27017/cafe', { useNewUrlParser: true, useUnifiedTopology: true })
.then(() => {
console.log('Connected to MongoDB');
})
.catch((error) => {
console.error('Error connecting to MongoDB:', error);
});
// Define a user schema
const userSchema = new mongoose.Schema({
username: { type: String, required: true },
password: { type: String, required: true }
});
// Define a user model
const User = mongoose.model('User', userSchema);
const productSchema = new mongoose.Schema({
name: { type: String, required: true },
price: { type: Number, required: true },
quantity: { type: Number, required: true }
});
const Product = mongoose.model('Product', productSchema);
// Register a new user
app.post('/register', async (req, res) => {
try {
const { username, password } = req.body;
// Check if the username already exists
const existingUser = await User.findOne({ username });
if (existingUser) {
return res.status(400).json({ message: 'Username already exists' });
}
// Hash the password
const hashedPassword = await bcrypt.hash(password, 10);
// Create a new user
const newUser = new User({ username, password: hashedPassword });
await newUser.save();
res.status(201).json({ message: 'User registered successfully' });
} catch (error) {
console.error('Error registering user:', error);
res.status(500).json({ message: 'Internal server error' });
}
});
// User login
app.post('/login', async (req, res) => {
try {
const { username, password } = req.body;
// Find the user by username
const user = await User.findOne({ username });
if (!user) {
return res.status(404).json({ message: 'User not found' });
}
// Compare the password
const isPasswordValid = await bcrypt.compare(password, user.password);
if (!isPasswordValid) {
return res.status(401).json({ message: 'Invalid password' });
}
res.status(200).json({ message: 'Login successful' });
} catch (error) {
console.error('Error logging in:', error);
res.status(500).json({ message: 'Internal server error' });
}
});
app.get('/products',async (req,res)=>{
try{
const products = await Product.find();
res.status(200).json(products);
}catch(error){
console.error('Error getting products:',error);
res.status(500).json({message:'Internal server error'});
}
})
app.post('/products',async (req,res)=>{
try{
const {name,price,quantity} = req.body;
const newProduct = new Product({name,price,quantity});
await newProduct.save();
res.status(201).json({message:'Product added successfully'});
}catch(error){
console.error('Error adding product:',error);
res.status(500).json({message:'Internal server error'});
}
})
app.put('/products/:id',async (req,res)=>{
try{
const {name,price,quantity} = req.body;
await Product.findByIdAndUpdate(req.params.id,{name,price,quantity});
res.status(200).json({message:'Product updated successfully'});
}catch(error){
console.error('Error updating product:',error);
res.status(500).json({message:'Internal server error'});
}
})
app.delete('/products/:id',async (req,res)=>{
try{
await Product.findByIdAndDelete(req.params.id);
res.status(200).json({message:'Product deleted successfully'});
}catch(error){
console.error('Error deleting product:',error);
res.status(500).json({message:'Internal server error'});
}
})
// Start the server
app.listen(3000, () => {
console.log('Server started on port 3000');
const express = require('express');
const mongoose = require('mongoose');
const bcrypt = require('bcrypt');
const cors = require('cors');

// Import required modules

// Create an Express app
const app = express();

// Enable CORS
app.use(express.json());
app.use(cors());

// Connect to MongoDB
mongoose.connect('mongodb://localhost:27017/cafe', { useNewUrlParser: true, useUnifiedTopology: true })
.then(() => {
console.log('Connected to MongoDB');
})
.catch((error) => {
console.error('Error connecting to MongoDB:', error);
});

// Define a user schema
const userSchema = new mongoose.Schema({
username: { type: String, required: true },
password: { type: String, required: true }
});

// Define a user model
const User = mongoose.model('User', userSchema);
const productSchema = new mongoose.Schema({
name: { type: String, required: true },
price: { type: Number, required: true },
quantity: { type: Number, required: true }
});
const Product = mongoose.model('Product', productSchema);
// Register a new user
app.post('/register', async (req, res) => {
try {
const { username, password } = req.body;

// Check if the username already exists
const existingUser = await User.findOne({ username });
if (existingUser) {
return res.status(400).json({ message: 'Username already exists' });
}

// Hash the password
const hashedPassword = await bcrypt.hash(password, 10);

// Create a new user
const newUser = new User({ username, password: hashedPassword });
await newUser.save();

res.status(201).json({ message: 'User registered successfully' });
} catch (error) {
console.error('Error registering user:', error);
res.status(500).json({ message: 'Internal server error' });
}
});

// User login
app.post('/login', async (req, res) => {
try {
const { username, password } = req.body;

// Find the user by username
const user = await User.findOne({ username });
if (!user) {
return res.status(404).json({ message: 'User not found' });
}

// Compare the password
const isPasswordValid = await bcrypt.compare(password, user.password);
if (!isPasswordValid) {
return res.status(401).json({ message: 'Invalid password' });
}

res.status(200).json({ message: 'Login successful' });
} catch (error) {
console.error('Error logging in:', error);
res.status(500).json({ message: 'Internal server error' });
}
});

app.get('/products',async (req,res)=>{
try{
const products = await Product.find();
res.status(200).json(products);
}catch(error){
console.error('Error getting products:',error);
res.status(500).json({message:'Internal server error'});
}
})

app.post('/products',async (req,res)=>{
try{
const {name,price,quantity} = req.body;
const newProduct = new Product({name,price,quantity});
await newProduct.save();
res.status(201).json({message:'Product added successfully'});
}catch(error){
console.error('Error adding product:',error);
res.status(500).json({message:'Internal server error'});
}
})

app.put('/products/:id',async (req,res)=>{
try{
const {name,price,quantity} = req.body;
await Product.findByIdAndUpdate(req.params.id,{name,price,quantity});
res.status(200).json({message:'Product updated successfully'});
}catch(error){
console.error('Error updating product:',error);
res.status(500).json({message:'Internal server error'});
}
})

app.delete('/products/:id',async (req,res)=>{
try{
await Product.findByIdAndDelete(req.params.id);
res.status(200).json({message:'Product deleted successfully'});
}catch(error){
console.error('Error deleting product:',error);
res.status(500).json({message:'Internal server error'});
}
})
// Start the server
app.listen(3000, () => {
console.log('Server started on port 3000');
});
17 changes: 17 additions & 0 deletions factorial using recursion.cpp
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Original file line number Diff line number Diff line change
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#include <bits/stdc++.h>
using namespace std;

void fact(int n,int ans){
if(n<1){
cout<<ans<<endl;
return;
}
fact(n-1,ans*n);
}

int main(){
int n;
cin>>n;
int ans=1;
fact(n,ans);
}
Binary file added factorial using recursion.exe
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