Basic Bank SmartContract

BankSmartContract.sol

pragma solidity 0.6.6;

contract OPPBank {
    int balance;
    
    constructor() public {
        balance=0;
    }
    
    function getBalance() view public returns(int) {
        return balance;
    }
    
    function depositBalance(int amount) public {
        balance = balance + amount;
    }
    
     function withdrawBalance(int amount) public {
        balance = balance - amount;
    }
    
}