[英]struct array function argument
I have the following code of declarations: 我有以下代码声明:
struct coord {
int x;
int y;
}
void rotateFig(struct coord[10][10]);
I need to implement rotateFig
. 我需要实现
rotateFig
。 I tried to start with following: 我试着从以下开始:
void rotateFig(struct coord[10][10] c)
{
//code
}
I can`t compile it - probaly the way I transfer c in the function definition is incorrect .How should I transfer c using given signature. 我不能编译它 - 可能我在函数定义中传递c的方式是不正确的。如何使用给定签名传输c。 Thank you
谢谢
Use this definition: 使用此定义:
void rotateFig(struct coord c[10][10])
{
//code
}
The array is the actual parameter, so the dimensions have to come after its name, not before. 数组是实际参数,因此维度必须在其名称之后,而不是之前。
Though other answers ARE enough, I prefer passing it as a pointer and passing the dimensions with it, this is more dynamic, and is the same for the //code
part: 虽然其他答案足够了,但我更喜欢将它作为指针传递并用它传递维度,这更加动态,对于
//code
部分也是如此:
void rotateFig(struct coord**, int, int);
void rotateFig(struct coord** c, int d1, int d2)
{
//code
}
struct coord
is a type and c
is a variable of type struct coord
which can hold 10 X 10
struct coord
elements. struct coord
是一种类型和c
是类型的变量struct coord
可容纳10 X 10
struct coord
元素。
So it should be as follows 所以它应该如下
void rotateFig(struct coord c[10][10])
One thing to note when working with multi-dimension array in C
is that it cannot be return back from a function. 在
C
多维数组时要注意的一点是它无法从函数返回。 For details, read this . 有关详情,请阅读此内容 。 So its not advised to use the above format as
C
by default passes arguments by value and not by address. 所以不建议使用上面的格式,因为默认情况下,
C
按值而不是按地址传递参数。
So as @Mr.TAMER mentioned in his answer, you should use the following 因此,@ Mr.TAMER在他的回答中提到,你应该使用以下内容
void rotateFig(struct coord** c, int d1, int d2)
OTOH, you can use the following rotate code for your reference! OTOH,您可以使用以下旋转代码供您参考! It rotates a 2d array to 90 degrees!
它将2d阵列旋转到90度!
#include <stdio.h>
#define N 10
int matrix[N][N];
void display()
{
int i, j;
printf("\n");
for (i=0; i<N; i++) {
for (j=0; j<N; j++)
printf("%3d", matrix[i][j]);
printf("\n");
}
printf("\n");
return;
}
int main()
{
int i, j, val = 1;
int layer, first, last, offset, top;
for (i=0; i<N; i++)
for (j=0; j<N; j++)
matrix[i][j] = val++;
display();
for (layer = 0; layer < N/2 ; layer++) {
first = layer;
last = N - layer - 1;
for (i=first; i< last ; i++) {
offset = i - first;
top = matrix[first][i];
matrix[first][i] = matrix[last-offset][first];
matrix[last-offset][first] = matrix[last][last-offset];
matrix[last][last-offset] = matrix[i][last];
matrix[i][last] = top;
}
}
display();
return 0;
}
Hope this helps! 希望这可以帮助!
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