student

// @custom:oz-upgrades-unsafe-allow
// @custom:dev-run-script ./contracts/3_student.sol
// SPDX-License-Identifier: Unlicensed
pragma solidity >=0.8.0;

contract Student {
    struct StudentInfo {
        uint256 prn;
        string name;
        string class;
        string department;
    }

    uint256 private prnCounter;
    mapping(uint256 => StudentInfo) private studentMap;

    event StudentAdded(uint256 prn, string name, string class, string department);
    event StudentDeleted(uint256 prn);

    function addStudent(
        string memory name,
        string memory class,
        string memory department
    ) public {
        prnCounter += 1;
        studentMap[prnCounter] = StudentInfo(prnCounter, name, class, department);
        emit StudentAdded(prnCounter, name, class, department);
    }

     function getStudent(uint256 _id) public view returns (StudentInfo memory) {
        require(studentMap[_id].prn != 0, "Student not found");
        return studentMap[_id];
    }

    function totalStudents() public view returns (uint256) {
        return prnCounter;
    }

    function deleteStudent(uint256 _prn) public {
        require(studentMap[_prn].prn != 0, "Student not found");
        delete studentMap[_prn];
        emit StudentDeleted(_prn);
    }

    fallback() external {
        addStudent("Unknown", "FE", "CSE");
    }
}