sampathkumarspace

//SPDX-License-Identifier:MIT

pragma solidity ^0.8.7;

contract Smapping{
//mapping

//mapping(keytype => vauletype)visibility identifier; // similar to array , can get value with index number here you can get value with key which you assign for value
// you can add more values 
mapping(uint => mapping (uint => string)) person;

sampathkumarspace

//SPDX-License-Identifier:MIT

pragma solidity ^0.8.7;

contract arrays{
   
    uint[] public numbers = [1, 2, 3]; //dynamic array size not fixed
    int [3] public intnum = [-2, 3, 4]; // integers must be with -ve value in arrays 
// fixed Size array and dynamic
// push (add value in array)

sampathkumarspace

//SPDX-License-Identifier:MIT

pragma solidity ^0.8.7;

contract simfun{
    
    string public constant name = "Sam"; // used constant to use pure in funtion if it is public then we can remove constant 
    //function identifier() public view /pure returns(){ return name;}

    function fun()public pure returns(string memory) {

sampathkumarspace

//SPDX-License-Identifier:MIT
//This Program is about to understand datatypes in solidity
pragma solidity ^0.8.7;

contract Simple{
    //int, uint, string, address, bool

    int public num = 369;
    uint private unum = 7; //no -ve value or 0 allowed 
    string public nam = "sam";