C语言中二维数组a[3][4]行列元素互换，存到另一个数组中。

#include<stdio.h>
void main(){
  int a[3][4] = {{0,1,2,3},{4,5,6,7},{8,9,10,11}};
  int b[4][3],i,j;
  printf("array a:\n");
  for(i = 0; i <= 2; i++){
    for(j = 0; j <= 3; j++){
       printf("%4d",a[i][j]);
       b[j][i] = a[i][j];
    }
    printf("\n");
  }
  printf("array b: \n");
  for(i = 0; i <= 3; i++)
  {    
      for(j = 0; j <= 2; j++)
    {
      printf("%4d", b[i][j]);
    }
     printf("\n");
  }
}