Solidity 编译错误 Data location must be "memory" for return parameter in function, but none was given
Solidity 中，如果返回值的类型是 string ，则需要在 string 关键字后面添加 memory 关键字，否则会报错
'HelloWorldContract.sol:3:42: TypeError: Data location must be "memory" for return parameter in function, but none was given.
function sayHi() public view returns (string){
添加之后的代码大概类似于
pragma solidity ^0.5.8;
contract HelloWorldContract {
function sayHi() public pure returns (string memory _greeting){
_greeting = 'Hello World';
}
}
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