Question

我想使用迭代器打印矢量：

<?php
    session_start();    

        if (isset($_REQUEST['submit'])) {
            $number = $_REQUEST['number'];

            if (!isSet($_SESSION['number'])) {
                $_SESSION['number'] = array();
            }
        array_push($_SESSION['number'], $number);

       /* foreach($_SESSION['number'] as $key => $val) {
            echo $key . ">" . $val;
        }
        */
        var_dump($_SESSION['number']);
    }

?>    

<html>
<head>
    <title>13.13</title>

<body>
    <h2> Inputting numbers into array through form</h2>
    <br>
    <br>

    <form method="post" action="#">
        <input type="text" name="number" />
        <input type="submit" value="submit" name="submit" />
    </form>



</body>

我收到此错误：

DECLARE @Table1 TABLE (
     Company_ID INT,
     Person_ID INT,
     [Name] VARCHAR(MAX),
     Departement_ID INT
    )
INSERT  INTO @Table1
VALUES
        (1,1,'aaa',1),
        (1,2,'bbb',1),
        (1,3,'ccc',1),
        (1,4,'ddd',2),
        (2,5,'eee',1),
        (2,6,'fff',2),
        (2,7,'ggg',2)

DECLARE @Departement INT = 1
SELECT
    Company_ID,
    MAX(CASE WHEN seqnum = 1 THEN Person_ID END) AS Contact1ID_Dpt,
    MAX(CASE WHEN seqnum = 1 THEN [Name] END) AS Contact1Name_Dpt,
    MAX(CASE WHEN seqnum = 2 THEN Person_ID END) AS Contact2ID_Dpt,
    MAX(CASE WHEN seqnum = 2 THEN [Name] END) AS Contact2Name_Dpt
FROM
    (SELECT 
        t.*,
        ROW_NUMBER () OVER (PARTITION BY Company_ID ORDER BY Person_ID) AS seqnum 
    FROM 
        @Table1 t
    WHERE   --add your department filter here.
        Departement_ID = @Departement
    ) t

GROUP BY
    Company_ID;

你能帮帮我吗？

我想我正在转换我在int类型中收到的字符串。也许我没有以正确的方式使用迭代器（我认为这是问题，但我真的不知道）

提前致谢。

Answer 1

如果你想在矢量中打印int，我猜你想要使用：

for (vector<int>::iterator it = start.begin() ; it != start.end(); ++it)
    cout << "\t" << *it;

注意我使用*将迭代器it更改为当前迭代的值。我不明白你试图用j上的循环做什么，所以我把它丢弃了。

Answer 2

在您更新的代码中

10/19/2015  10  122

您没有取消引用cout << "\t" << it;并且没有输出it的函数，因此您收到编译器错误。将代码更改为

vector<int>::iterator

应该修理它。

作为一个侧面，什么是嵌套for循环？

使用iterator c ++打印矢量

2 个答案: