Solidity-Variables

1. Pragma The first line is a pragma directive which tells that the source code is written for the Solidity version eg.

pragma solidity >= 0.5.0 < 0.9.0;

2. Contract A Solidity contract is a collection of code (its functions) and data (its state) that resides at a specific address on the Ethereumblockchain. eg.

 Contract State {
  }

3. State variables There are 3 ways to assign value to a state variable

1. state variable: get stored directly on the blockchain

   uint public age=10;
   

2. Using Constructor: A constructor code is executed once when a contract is created and it is used to initialize the contract state.

   constructor() public
   {    
       age=10;
   }
   

3. Using Setter Function: A function is a group of reusable codes that can be called anywhere in your program.

   function setAge() public 
   { 
       age=10;
   }
   

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