4.10 Print the primary and secondary diagonal of an array

1 //Print the main diagonal and sub-diagonal of a two-dimensional array matrix2#include <stdio.h>3 4 intMainvoid)5 {6     intarr[5][5] = {1,2,3,4,5,7                      6,7,8,9,Ten,8                       One, A, -, -, the,9                       -, -, -, +, -,Ten                       +, A, at, -, -}; One     inti,j; A #if0 -      for(i=0;i<5; i++) -     { the          for(j=0;j<5; j + +) -         { -printf"%d%d", i,j); -         } +Putchar (Ten); -     } +Putchar (Ten); A  at #endif -  - #if0//Method 1, the basic traversal of the data in memory storage in the order of filtering printing.  - //Print Main diagonal -      for(i=0;i<5; i++) -     { in          for(j=0;j<5; j + +) -         { to             if(i==j) +printf"%d%d", i,j); -         } thePutchar (Ten); *     } $Putchar (Ten);Panax Notoginseng //Print a secondary diagonal line -      for(i=0;i<5; i++) the     { +          for(j=0;j<5; j + +) A         { the             if(i+j==4) +printf"%d%d", i,j); -         } $Putchar (Ten); $     } -Putchar (Ten); -  the #endif - Wuyi #if0//Method 2 directly traverses only two diagonal lines and is efficient.  the //Print Main diagonal -      for(i =0;i<5; i++) Wu     { -printf"%d", Arr[i][i]); About     } $Putchar (Ten); - //Print a secondary diagonal line -      for(i =0;i<5; i++) -     { Aprintf"%d", arr[i][5-1-i]); +     } thePutchar (Ten); -  $ #endif the  the     return 0; the}

4.10 Print the primary and secondary diagonal of an array