update to sol 0.8.34

Author: AmazingAng

01_HelloWeb3/HelloWeb3.sol

@@ -1,5 +1,5 @@
 // SPDX-License-Identifier: MIT
-pragma solidity ^0.8.21;
+pragma solidity ^0.8.34;
 contract HelloWeb3{
     string public _string = "Hello Web3!";
 }

02_ValueTypes/ValueTypes.sol

@@ -1,5 +1,5 @@
 // SPDX-License-Identifier: MIT
-pragma solidity ^0.8.21;
+pragma solidity ^0.8.34;
 contract ValueTypes{
     // 布尔值
     bool public _bool = true;

03_Function/Function.sol

@@ -1,5 +1,5 @@
 // SPDX-License-Identifier: MIT
-pragma solidity ^0.8.21;
+pragma solidity ^0.8.34;
 contract FunctionTypes{
     uint256 public number = 5;
 

04_Return/Return.sol

@@ -1,5 +1,5 @@
 // SPDX-License-Identifier: MIT
-pragma solidity ^0.8.21;
+pragma solidity ^0.8.34;
 
 // 返回多个变量
 // 命名式返回

05_DataStorage/DataStorage.sol

@@ -1,5 +1,5 @@
 // SPDX-License-Identifier: MIT
-pragma solidity ^0.8.21;
+pragma solidity ^0.8.34;
 
 contract DataStorage {
     // The data location of x is storage.

06_ArrayAndStruct/ArrayAndStruct.sol

@@ -1,5 +1,5 @@
 // SPDX-License-Identifier: MIT
-pragma solidity ^0.8.21;
+pragma solidity ^0.8.34;
 contract ArrayTypes {
 
     // 固定长度 Array
@@ -32,7 +32,7 @@ contract ArrayTypes {
     }
 }
 
-pragma solidity ^0.8.21;
+pragma solidity ^0.8.34;
 contract StructTypes {
     // 结构体 Struct
     struct Student{
@@ -65,7 +65,7 @@ contract StructTypes {
     }
 }
 
-pragma solidity ^0.8.21;
+pragma solidity ^0.8.34;
 contract EnumTypes {
     // 将uint 0， 1， 2表示为Buy, Hold, Sell
     enum ActionSet { Buy, Hold, Sell }

07_Mapping/Mapping.sol

@@ -1,5 +1,5 @@
 // SPDX-License-Identifier: MIT
-pragma solidity ^0.8.21;
+pragma solidity ^0.8.34;
 contract Mapping {
     mapping(uint => address) public idToAddress; // id映射到地址
     mapping(address => address) public swapPair; // 币对的映射，地址到地址

08_InitialValue/InitialValue.sol

@@ -1,5 +1,5 @@
 // SPDX-License-Identifier: MIT
-pragma solidity ^0.8.21;
+pragma solidity ^0.8.34;
 
 contract InitialValue {
     // Value Types

09_Constant/Constant.sol

@@ -1,5 +1,5 @@
 // SPDX-License-Identifier: MIT
-pragma solidity ^0.8.21;
+pragma solidity ^0.8.34;
 contract Constant {
     // constant变量必须在声明的时候初始化，之后不能改变
     uint256 public constant CONSTANT_NUM = 10;

10_InsertionSort/InsertionSort.sol

@@ -1,5 +1,5 @@
 // SPDX-License-Identifier: MIT
-pragma solidity ^0.8.21;
+pragma solidity ^0.8.34;
 contract InsertionSort {
     // if else
     function ifElseTest(uint256 _number) public pure returns(bool){