Solidity 101

pragma solidity ^0.4.17;

contract BasicCal {
   
   bytes1 a = 0xb5;
   bytes1 b = 0x56;
   
   bytes1 eg1 = and(a,b);
   bytes1 eg2 = or(a,b);
   bytes1 eg3 = xor(a,b);
   bytes1 eq4 = not(a,b);
   
   function and(bytes1 a, bytes1 b) returns(bytes1){
       return a&b;
   }
   
   function or(bytes1 a, bytes1 b) returns(bytes1){
       return a|b;
   }
   
    function xor(bytes1 a, bytes1 b) returns(bytes1){
       return a^b;
   }
   
   function not(bytes1 a, bytes1 b) returns(bytes1){
       return a&b;
   }
}

pragma solidity ^0.4.17;

contract AdvCalculator {

  // Result of the operation are always stored in this variable
  uint result=10;

  function Calculator() public {
    // constructor
    
  }

  // returns the result
  function getResult() public view returns (uint) {
    return result;
  }

  // result = result + num
  function addToNumber(uint num) public {
    result += num;
  }

  // result = result - num
  function substractNumber(uint num) public {
    result -= num;
  }

  // result = result * num
  function multiplyWithNumber(uint num) public {
    result *= num;
  }

  // result = result / num
  function divideByNumber(uint num) public {
    result /= num;
  }

}