Merge pull request #2 from Anish-Bansode/anish-branch

Added two new blockchain codes (Bank and Student Solidity Contracts)

Author: Shriharsh-Deshmukh

13 - Bank Solidity Contract/bank.sol

@@ -0,0 +1,42 @@
+// SPDX-License-Identifier: MIT
+pragma solidity ^0.8.0;
+
+contract BankAccount {
+    // State variable to store the balance of each account
+    mapping(address => uint256) private balances;
+
+    // Event to log deposits
+    event Deposit(address indexed account, uint256 amount);
+
+    // Event to log withdrawals
+    event Withdraw(address indexed account, uint256 amount);
+
+    // Function to deposit money into the account
+    function deposit(uint256 amount) public payable {
+        require(amount > 0, "Deposit amount must be greater than zero");
+        // Ensure the value sent with the transaction matches the amount specified
+        require(msg.value == amount, "Amount does not match the value sent");
+
+        balances[msg.sender] += msg.value;
+
+        emit Deposit(msg.sender, msg.value);
+    }
+
+    // Function to withdraw money from the account
+    function withdraw(uint256 amount) public {
+        require(amount > 0, "Withdrawal amount must be greater than zero");
+        require(balances[msg.sender] >= amount, "Insufficient balance");
+
+        balances[msg.sender] -= amount;
+
+        // Transfer the amount back to the caller
+        payable(msg.sender).transfer(amount);
+
+        emit Withdraw(msg.sender, amount);
+    }
+
+    // Function to check the balance of the account
+    function getBalance() public view returns (uint256) {
+        return balances[msg.sender];
+    }
+}

14 - Student Solidity Contract/Student.sol

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+// SPDX-License-Identifier: MIT
+pragma solidity ^0.8.0;
+
+contract StudentData {
+    struct Student {
+        uint id;
+        string name;
+        uint age;
+        string course;
+    }
+
+    Student[] public students; // Array to store student records
+    uint public studentCount = 0;
+
+    // Function to add a new student
+    function addStudent(string memory _name, uint _age, string memory _course) public {
+        studentCount++;
+        students.push(Student(studentCount, _name, _age, _course));
+    }
+
+    // Function to retrieve a student's data by ID
+    function getStudent(uint _id) public view returns (uint, string memory, uint, string memory) {
+        require(_id > 0 && _id <= studentCount, "Student ID out of range");
+        Student memory student = students[_id - 1];
+        return (student.id, student.name, student.age, student.course);
+    }
+
+    // Fallback function to handle unexpected transactions
+    fallback() external payable {}
+
+    // Receive function to handle direct Ether transfers
+    receive() external payable {}
+
+    // Function to check the balance of the contract
+    function getBalance() public view returns (uint) {
+        return address(this).balance;
+    }
+}