How to write a matrix rotation problem in C

#include

#include

#define n 9

void main()

int m,a[n][n];

char ch1,ch2;

int i=0,j=0;

int n=1,p=0;l: do

The original author did not write the logical words in the conditional statement, resulting in compilation errors, which have all been modified and can be run directly, and this **effect is not a rotation matrix, but a matrix, which is composed of outward to inward rotation.

You can write an arbitrary order with a pointer...

Do you want to be clockwise or counterclockwise.

Do you want to be counterclockwise or clockwise.

Clockwise, transpose it, flip it horizontally and you're good to go.

Counterclockwise, transpose it, flip it vertically, and you're good to go.

#include

#include

#define n 4

void show(int a[n][n])printf("");

printf("--");

int main()

show(a);

for (i = 0; i < n; i++)show(a);

This is a clockwise horizontal flip, note that it cannot run at the same time as the vertical flip below, otherwise it will be flipped horizontally and vertically again.

for (i = 0; i < n; i++)show(a);*/

for (i = 0; i < n; i++)show(a);

return 0;}

Hello landlord!

This is a matrix transpose problem, according to the definition of transpose as follows:

The matrix a is transposed to such an n m matrix b satisfying b = a(j,i), i.e. b (i,j) = a (j,i) (the i-row j-column elements of b are the i-column i-column elements of a).

Therefore, according to the definition, the part is changed as follows: (change the original i to j, the original j to i, num[i][n-1] to num[n-1][j], the specific reference is as follows**).

for(int i=0;iThe above paragraph is changed to the following paragraph!

void rotatearr(){

int temp[row][col], i, j, k;

for (i=0,j=col-1; j>=0; i++,j--)for (k=0; ktemp[k][j] = arr[i][k];temp is used as a temporary array to store the ARR array after 90 degrees flipping.

for (i=0; ifor (j=0; jprintf("%5d",arr[i][j] = temp[i][j]);The contents of the temp array are assigned to the arr array one by one to change the value of the arr array, so that the value of arr will change continuously when the rotatearr function is called multiple times.

printf("");

printf("");

Two-dimensional arrays, you just think of the arrays in the array as convenient, don't look at the source code, think of it yourself to remember clearly.

Take the math formula and you're done. This question is not about C++ programs, but about mathematics.