I have the following code of declarations:
struct coord {
int x;
int y;
}
void rotateFig(struct coord[10][10]);
I need to implement rotateFig.
I tried to start with following:
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. Thank you
Use this definition:
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.
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:
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.
So it should be as follows
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. For details, read this. So its not advised to use the above format as C by default passes arguments by value and not by address.
So as @Mr.TAMER mentioned in his answer, you should use the following
void rotateFig(struct coord** c, int d1, int d2)
OTOH, you can use the following rotate code for your reference! It rotates a 2d array to 90 degrees!
#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!
