BitDegree Solidity课程作业：setName修改与increaseCounter实现求助

Hey there! Let's get your FunctionTest contract sorted out with the two tasks you need to complete. I'll walk you through the fixes and explain each part clearly.

Full Updated Code #

pragma solidity ^0.4.16;
contract FunctionTest {
 bool public foo = true;
 string public name;
 uint256 public counter = 0;

 // Fixed setName function to accept and set the name value
 function setName(string _newName) public {
     name = _newName;
 }

 // New function to increase counter by 10 on each call
 function increaseCounter() public {
     counter += 10;
 }

 function writeToStorage() {
     foo = !foo;
 }

 function readFromStorageConstant() public constant returns (bool) {
     return foo;
 }

 function readFromStorageView() public view returns (bool) {
     return foo;
 }
}

Breakdown of Changes #

1. Fixing the setName Function

The original setName had no way to receive the new name value—here's what I added:

• Added a parameter string _newName to the function (the leading underscore is a common Solidity convention to distinguish function parameters from state variables)
• Added the line name = _newName; inside the function body, which assigns the passed value to the public name state variable
• Kept the public visibility modifier so you can call this function from outside the contract

2. Adding the increaseCounter Function

This one's straightforward:

• Created a new public function (so it's callable externally) named increaseCounter
• Inside the function, used the shorthand counter += 10; to add 10 to the existing counter value (you could also write counter = counter + 10;—both work the same)

Quick Notes #

• Since you're using Solidity ^0.4.16, the syntax above is fully compatible with that version
• All state variables (name, counter) are public, so you can easily read their values after calling the functions

内容的提问来源于stack exchange，提问作者GG123GG