函数概述

如何在 Solidity 中声明函数

1// SPDX-License-Identifier: GPL-3.0
2
3pragma solidity >=0.7.0 <0.9.0;
4
5contract TestContract {
6  function testFunction(int num1, int num2) public pure returns (int num3) {
7    num3 = num1 + num2;
8  }
9}

在 Solidity 中声明函数的另一种方式

1// SPDX-License-Identifier: GPL-3.0
2
3pragma solidity >=0.7.0 <0.9.0;
4
5contract TestContract {
6  function testFunction(int num1, int num2) external pure returns (int) {
7    int num3 = num1 + num2;
8    return num3;
9  }
10}

演示 view 函数的示例代码

1// SPDX-License-Identifier: GPL-3.0
2
3pragma solidity >=0.7.0 <0.9.0;
4
5contract TestContract {
6  int public testNumber = 20;
7
8  function testFunction(int num1, int num2) external view returns (int) {
9    int num3 = num1 + num2 + testNumber;
10    return num3;
11  }
12}