Contracts, Functions, State Variables, Getters & Setters

Blockchain Programming Course
#1

Welcome to the thread about Contracts, Functions, State Variables, Getters & Setters in Ethereum. Here you can discuss everything about this chapter.

2 Likes
#2

Remix is ran from browser only right?

#3

Yes, correct. https://remix.ethereum.org

2 Likes
#4

Hi, I have just started using remix but there was no “CREATE” button in my RUN tab, only a “DEPLOY” button. Is there something I am doing wrong here?

2 Likes
#5

In older versions of remix it used to be called the “Create” button but has now changed to “Deploy” so what you’re doing is fine.

6 Likes
#6

Congratulations on making it to the blockchain everyone! It’s time to carve our name into it’s immutable history!

pragma solidity 0.4.0;
contract Name {
   string name;
   function setName(string _name){
       name = _name;
   }
   function getName() view returns (string){
       return name;
   }
}

Now how to push those pesky strings into an array of names?

1 Like
#7 
pragma solidity ^0.4.0;

contract Name{
   string name;
   uint age;
   function setName(string _name){
       name = _name;
   }
   function setAge(uint _age){
       age = _age;
   }
  function getName() view returns (string){
      return name;
  }
  function getAge() view returns (uint){
      return age;
  }
}
#8

I assume that’s normal to not understand everything in types documentations at this stage ? :slight_smile:

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#9

Yes, absolutely. You will learn as you progress through the course. But it is always good to learn to use the documentation to search for answers to potential questions that arise.

1 Like
#10

I wonder how many people have made it this far… I’m really digging this course and only had pretty minimal prior knowledge. It would probably be a good idea for me to review C++ as I move through this section. Great work @filip and @ivan! I am super happy to have purchased this course.

5 Likes
#11

Hello Guys!, When i try to run setOutput function, this happen: SyntaxError: Unexpected token G in JSON at position 1.

CODE:

contract Dog {

string output = "Doggie";

function bark() view public returns (string)  {
   
   return output; 
    
}

function  setOutput  (string _output) public  {
    
    output = _output;
}

}

#12

It happend with my assigment code too and in the stackoverflow page i did not see a familiar help to solve it :frowning:

#13

image
image1600×900 64.3 KB

I have problem with the strings variables. Any Help? :wink:

#14

Make sure that you input the value into the input box with quotes if it’s a string.

So if you want to change the output to test, you have to type “test” into the input box in remix. With the quotes.

3 Likes
#15

I dont get any output after running bark . There is no button for details. I can not find solution. Maybe I should change something in settings?

soliity%20problem
soliity%20problem1385×767 45.9 KB
s

2 Likes
#16

All looks good. The output is in the console. Click the little arrow next to [vm] in the console to see all details.

1 Like
#17

Evening all. Here’s my code for this:

pragma solidity ^0.4.0;

contract myNewContract {
    
    string name;
    uint age;
    
    function setName(string _newName) {
        name = _newName;
    }
    
    function setAge(uint _newAge) {
        age = _newAge;
    }
    
    function getName() view returns(string) {
        return name;
    }
    
    function getAge() view returns(uint) {
        return age;
    }
}
#18

Hi All,

Here is my code:

pragma solidity ^0.4.0;

contract Person{
    string name;
    uint age;
    function getName() public view returns(string) {
        return name;
    }
    
    function setName(string _name) public {
        name = _name;
    }
    
    function getAge() public view returns(uint) {
        return age;
    }
    
    function setAge(uint _age) public {
        age = _age;
    }
    
}
#20

I test in this solidity compiler ,test ok
http://remix.ethereum.org/#optimize=false&version=soljson-v0.4.23+commit.124ca40d.js

// 定義是用什麼Solidity的版本編譯
pragma solidity ^0.4.23;

contract Dog {

  string output = "Doggie";

   function bark() view public returns (string)  {
   
     return output; 
    
   }

   function  setOutput  (string _output) public  {
    
      output = _output;
   }
}
#21 
// 定義是用什麼Solidity的版本編譯
pragma solidity ^0.4.23;

//定義智能合約的名稱
contract GivMeMoney{
    
    uint output = 989;  //變數 string ,int ,uint, bool ..
    
    function wallet() view returns (uint) {  //函數 輸入 輸出
        return output;
    }
    function giveme(uint _output) {
        output = _output;
    } 
}

Here is my code ,test ok
http://remix.ethereum.org/#optimize=false&version=soljson-v0.4.23+commit.124ca40d.js

1 Like