solidity的控制流与其他语言类似，主要包括一下集中：

1. if-else

    //if-else
    function ifElseTest(uint256 _number) public pure returns(bool) {
        if(_number == 0) {
            return true;
        } else {
            return false;
        }
    }

1. for

    //for
    function forLoopTest() public pure returns(uint256) {
        uint sum = 0;
        for(uint i = 0; i < 10; i++) {
            sum += i;
        }

        return sum;
    }

1. while

    //while
    function whileTest() public pure returns(uint256) {
        uint sum = 0;
        uint i = 0;
        while(i < 10) {
            sum += i;
            i++;
        }

        return sum;
    }

1. do-while

     //do-while
    function doWhileTest() public pure returns(uint256) {
        uint sum = 0;
        uint i = 0;
        do {
            sum += i;
            i++;
        }while(i < 10);

        return sum;
    }

1. 三元运算符是solidity中唯一一个接收三个操作数的运算符，规则条件？条件真表达式：条件假表达式。

    //三元运算符
    function ternaryTest(uint256 x, uint256 y) public pure returns(uint256) {
        return x >= y ? x : y;
    }

另外患有continue和break关键字可以使用。

     //插入排序 错误版
    function insertionSortWrong(uint[] memory a) public pure returns(uint[] memory) {
        for(uint i = 1; i < a.length; i++) {
            uint temp = a[i];
            uint j = i - 1;
            while((j > 0) && (temp < a[i])) {
                a[j + 1] = a[j];
                j--;
            }

            a[j+1] = temp;
        }

        return a;
    }

    //插入排序，正确版
    function insertionSort(uint[] memory a) public pure returns(uint[] memory) {
        for(uint i = 1; i < a.length; i++) {
            uint temp = a[i];
            uint j = i;
            while((j >= 1) && (temp < a[j - 1])) {
                a[j] = a[j - 1];
                j--;
            }
            a[j] = temp;
        }

        return a;
        
    }