二维数组，C中的函数调用问题 [英] 2D array, function call question in C

问题描述

嗨

当我调用一个函数并在main函数中创建一个指向2D数组的指针时，我有一个问题。 "主"调用一个函数来输入在main函数中声明的数组中的数据。

Witch工作得非常好，但是我只希望发送我的2D数组的第一行，或者只发送第二行，只发送第三行等。但是。我发送整个数组，并且不知道如何一次只向数组的函数发送一行。在输入功能中，我使用fgets从键盘输入数据。


非常感谢答案


谢谢

Hi
I have a question when I call a function and creating a pointer to a 2D array in the main function. "Main" call a function to input data in a array witch is declared in the main function.
Witch works perfectly well, however I would like only to send the first row of my 2D array, or only the second row, only the third row etc. A.t.m. I send the entire array, and don′t know how to just send one row at a time to the function, of the array. In the input function i input data from the keyboard using fgets.


Would really appreciate an answer

Thanks

推荐答案

如果要发送一行，最好将该行复制到一个新数组中并传递它。

If you want to send one row it is best to copy that row into a new array and pass that.

嗨
我在调用函数并在main函数中创建指向2D数组的指针时有一个问题。 "主"调用一个函数来输入在main函数中声明的数组中的数据。

Witch工作得非常好，但是我只希望发送我的2D数组的第一行，或者只发送第二行，只发送第三行等。但是。我发送整个数组，并且不知道如何一次只向数组的函数发送一行。在输入功能中，我使用fgets从键盘输入数据。


非常感谢答案


谢谢

Hi
I have a question when I call a function and creating a pointer to a 2D array in the main function. "Main" call a function to input data in a array witch is declared in the main function.
Witch works perfectly well, however I would like only to send the first row of my 2D array, or only the second row, only the third row etc. A.t.m. I send the entire array, and don′t know how to just send one row at a time to the function, of the array. In the input function i input data from the keyboard using fgets.


Would really appreciate an answer

Thanks

因为行在主行的内存中布局，所以只发送单个行非常简单。你不需要复制任何东西。


试试这段代码：

because the rows are laid out in memory in row major, its quite simple to send just the individual rows. you dont need to copy anything.

try this code:

展开 | 选择 | Wrap | 行号

但是我只想发送我的2D数组的第一行，或者只发送第二行，只发送第三行等等。我发送整个数组，并且不知道如何一次只向数组的函数发送一行。

however I would like only to send the first row of my 2D array, or only the second row, only the third row etc. A.t.m. I send the entire array, and don′t know how to just send one row at a time to the function, of the array.

在C和C ++中，您无法将数组传递给函数。函数争论只能是类型或指向类型的指针。数组不是类型。因此，数组是指针。


规则是数组的名称是元素0的地址。当您将数组传递给函数时，只传递地址元素0.


考虑这个：

In C and C++ you cannot pass an array to a function. Function arguiments can only be a type or a pointer to a type. An array is not a type. Therefore, an array is a pointer.

The rule is that the name of the array is the address of element 0. When you pass the array to a funciton, you pass only the address of element 0.

Consider this:

展开 | 选择 | Wrap < span class =codeDivider> | 行号

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