Created using remix-ide: Realtime Ethereum Contract Compiler and Runtime. Load this file by pasting this gists URL or ID at https://remix.ethereum.org/#version=soljson-v0.8.7+commit.e28d00a7.js&optimize=false&runs=200&gist=

contracts...fixedsize.sol

//SPDX-License-Identifier: MIT

pragma solidity ^0.8;

contract fixedSizeArray{

        uint[5] public arr = [10,20,30,50,70];
        uint[10] arr2;
        uint[5] public arr3;

        constructor(){
            arr3 = [100,200,300];
        }

        function arrayTest() public returns(uint){
           // uint[] memory array4 =  new uint[](3);  //local varuable
            uint temp;
            temp = arr[2];

            arr[2] = 1000;

            delete arr[4];
            return temp;
        }

        function arrayTest2(uint _x) public returns(uint[10] memory){
            //in function we can used only fixed size array array
          
            for(uint i=0;i<arr2.length;i++){
                arr2[i] = _x*i;
            }
            return arr2;
        }

        function getArray2() public view returns(uint[10] memory){
            return arr2;
        }
         function getArray() public view returns(uint[5] memory){
            return arr;
        }
        function getArray3() public view returns(uint[5] memory){
            return arr3;
        }
        function setArray3(uint _index,uint _value) public returns(uint[5] memory){
            arr3[_index]= _value;

            return arr3;
        }

        function deleteArray3(uint _index) public returns(uint[5] memory){
            delete arr3[_index];
            return arr3;
        }
}