#include <stdio.h>
void rotate(int* x, int rank)
{
?int* y = (int*)malloc(sizeof(int) * rank * rank);?

?

?for(int i=0; i<rank * rank; i++)
?{
???????? // 以原第一行進行分析? 一行數變為同一列? 以原第一列為例，變為同一行。? (i%rank)*rank使列變為行?? rank-(i/rank)-1) 使行變為列
??y[(i%rank)*rank+(rank-(i/rank)-1) ] = x[i];?
?}

?for(i=0; i<rank*rank; i++)
?{
??x[i] = y[i];
?}

?free(y);
}

int main(int argc, char* argv[])
{
?int x[4][4] = {{1,2,3,4},{5,6,7,8},{9,10,11,12},{13,14,15,16}};
?int rank = 4;

?rotate(&x[0][0], rank);

?for(int i=0; i<rank; i++)
?{
??for(int j=0; j<rank; j++)
??{
???printf("%4d", x[i][j]);
??}
??printf("/n");
?}

?return 0;
}