Print the matrix clockwise (counterclockwise) and counter-clockwise.

Print the matrix clockwise (counterclockwise) and counter-clockwise.

Description: print an arbitrary arr [line] [row] matrix clockwise, for example:

Arr [5] [4]

1	2	3	4
14	15	16	5
13	20	17	6
12	19	18	7
11	10	9	8

Arr [5] [5]

1	16	15	14	13
2	17	24	23	12
3	18	25	22	11
4	19	20	21	10
5	6	7	8	9

 

 

 

 

 

 

Idea: print the first circle clockwise

Print arr [0] [0] To the right ---> arr [0] [row-1]

Print arr [1] [row-1] ---> arr [line-1] [row-1]

Print arr [line-1] [row-2] To the left ---> arr [line-1] [0]

Finally, print arr [line-2] [0] ---> arr [1] [0]

Then, the nth circle starts from arr [n] [n] as the first element until it ends. The cnt count can be used as the exit condition because num <= line * row

When it is not a matrix of level m, there are n loops n = (line <row? Line: row)/2

Val reduces the cycle size by 2.

Note: Unlike starting coordinates

#include<stdio.h>#include<stdlib.h>#define line 5#define row 4int main(int argc,char* argv[]){    int j,i,num,n,val;    int arr[line][row] = {0};    val = line < row ? line : row;    n = 0;    num = 1;    for(val;val > 0;val -=2,n ++)    {        for(i = n,j = n;(i < line - n )&& (num <= line * row );i ++,num ++)            arr[i][j] = num;        for(-- i,++ j;(j < row - n )&& (num <= line * row );j ++,num ++)            arr[i][j] = num;        for(--i,--j;(i >= n )&& (num <= line * row );i --,num ++)            arr[i][j] = num;        for(++ i,--j;(j > n )&& (num <= line * row );j --,num ++)            arr[i][j] = num;    }    for(i = 0;i < line;i++)    {        for(j = 0;j < row;j++)            printf("%4d",arr[i][j]);        printf("\n");    }    system("pause");    return 0;}

 

Counterclockwise:

#include<stdio.h>#include<stdlib.h>#define line 5#define row 5int main(int argc,char* argv[]){    int j,i,num,n,val;    int arr[line][row] = {0};    val = line < row ? line : row;    n = 0;    num = 1;    for(val;val > 0;val -=2,n ++)    {        for(i = n,j = n;(i < line - n )&& (num <= line * row );i ++,num ++)            arr[i][j] = num;        for(-- i,++ j;(j < row - n )&& (num <= line * row );j ++,num ++)            arr[i][j] = num;        for(--i,--j;(i >= n )&& (num <= line * row );i --,num ++)            arr[i][j] = num;        for(++ i,--j;(j > n )&& (num <= line * row );j --,num ++)            arr[i][j] = num;    }    for(i = 0;i < line;i++)    {        for(j = 0;j < row;j++)            printf("%4d",arr[i][j]);        printf("\n");    }    system("pause");    return 0;}