Update part2_Solidity基础.md
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## 四、练习题
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## 四、练习题
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### 4.1`将固定长度字节数组转化为`string类型
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### 4.1 将固定长度字节数组转化为`string`类型
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```javascript
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```javascript
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pragma solidity ^0.4.0;
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pragma solidity ^0.4.0;
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}
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}
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```
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```
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### 4.2
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### 4.2 实现一个带有简单逻辑判断及多种数学运算的Solidity程序
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**参考自:**
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**参考自:**
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