C 语言中的二维数组

arr[0][0] = 1
arr[0][1] = 2
arr[0][2] = 3
arr[1][0] = 2
arr[1][1] = 3
arr[1][2] = 4
arr[2][0] = 3
arr[2][1] = 4
arr[2][2] = 5
arr[3][0] = 4
arr[3][1] = 5
arr[3][2] = 6

Enter a[0][0]: 56   
Enter a[0][1]: 10   
Enter a[0][2]: 30  
Enter a[1][0]: 34  
Enter a[1][1]: 21 
Enter a[1][2]: 34    

Enter a[2][0]: 45
Enter a[2][1]: 56
Enter a[2][2]: 78   

 printing the elements .... 
 
56      10      30  
34      21      34  
45      56      78