• What is Smart Contract ?

  Smart contracts are simply programs stored on a blockchain that run when predetermined conditions are met.

• Solidity Task - 1

  Basic smart contract in which we can deposit ethers and can see the balance of Smart Contract.

          Let's start with the Smart Contract :

•   First we will declare the compiler version:

  pragma solidity ^0.7.2;
  

•   Declare contract name with contract keyword:    

  pragma solidity ^0.7.2 ;
  
  contract MyContract {
  
  }
  

•      Now, we will create two functions depositEth() & getContractBal().

  pragma solidity ^0.7.2;
  
  contract MyContract{
  
            function depositEth() public payable {
            //it will send the ethers to smart contract 
           }
  }

   "payable" keyword allows a function to receive ether. This function will receive ethers and send it to smart contract."Public" is a visibility. Any contract and account can call this function if visibility is public.

• Creating getContractBal() :

  pragma solidity ^0.7.2;
  
  contract MyContract{
  
            function depositEth() public payable {
            //it will send the ethers to smart contract 
           }
  
           function getContractBal() public view returns (uint){
               return address(this).balance;
           }
  }

  getContractBal() function will return the contract balance. "address(this).balance" this line shows the balance of contract. Function is defined as a view because it ensures that it will not modify any state.