10*10字符数组（元素都是'.'）作为棋盘，要求写出随机步，从随机的一点开始，随机向上下左右走

Question

走过的元素，用大写英文字母A-Z按顺序代替，运行出来乱七八糟的，斜着走，还跳2步。觉得自己写的很冗长，还没实现功能。
#include
#include
#include
#define RAW 10
#define COL 10
#define DIREC 4

int main(void)
{
char Checkerboard[RAW][COL],Letter[26];
int i=0,j=0,direction,k=1;
for(i=0;i<RAW;i++){
for(j=0;j<COL;j++)
Checkerboard[i][j]='.';
}
Letter[0]='A';
for(i=1;i<26;i++)
Letter[i]=Letter[i-1]+1;//26字母存入数组

srand((unsigned)time(NULL));
    i=rand()%RAW;//余数0,1,2,3.....9
    j=rand()%COL;//余数0,1,2,3.....9
    Checkerboard[i][j]=Letter[0];//确定棋盘上第一个字母A的位置

    while(Checkerboard[i+1][j]=='.'||Checkerboard[i-1][j]=='.'||Checkerboard[i][j+1]=='.' ||Checkerboard[i][j-1]=='.'){

        direction=rand() % DIREC;//余数0,1,2,3代表方向
        switch(direction){
        case 0:
            i--;//上移
            if((i<10 && i>=0) && Checkerboard[i][j]=='.' ){
                 Checkerboard[i][j]=Letter[k];
                 k++;
                 break;
            }
                 else
                 break;
        case 1:
            i++;//下移
            if((i<10 && i>=0) && Checkerboard[i][j]=='.' ){
                 Checkerboard[i][j]=Letter[k];
                 k++;
                 break;
            }
                 else
                 break;
        case 2:
            j--;//左移
            if((j<10 && j>=0) && Checkerboard[i][j]=='.' ){
                 Checkerboard[i][j]=Letter[k];
                 k++;
                 break;
            }
                 else
            break;
        case 3:
            j++;//右移
            if((j<10 && j>=0) && Checkerboard[i][j]=='.' ){
                 Checkerboard[i][j]=Letter[k];
                 k++;
                 break;
            }
                 else
                break;
        }
    }
    for(i=0;i<RAW;i++){
       for(j=0;j<COL;j++)
        printf(" %c",Checkerboard[i][j]);
    printf("\n");
    }
return 0;

}

Answer 1

再看一下这个

 #include <stdio.h>
#include<stdlib.h>
#include <time.h>

#define RAW 10
#define COL 10
#define DIREC 4

int main(void) {
    char Checkerboard[RAW][COL], Letter[26];
    int i = 0, j = 0, direction, k = 0;
    for (i = 0; i < RAW; i++) {
        for (j = 0; j < COL; j++)
            Checkerboard[i][j] = '.';
    }
//    Letter[0] = 'A';
    for (i = 0; i < 26; i++)
        Letter[i] = 'A' + i;

    srand((unsigned) time(NULL));
    i = rand() % RAW;//余数0,1,2,3.....9
    j = rand() % COL;//余数0,1,2,3.....9
    Checkerboard[i][j] = Letter[0];//确定棋盘上第一个字母A的位置
    k = 1;
    while (k < 26) {
        if (!((i < RAW - 1 && Checkerboard[i + 1][j] == '.') ||
              (i > 0 && Checkerboard[i - 1][j] == '.') ||
              (j < COL - 1 && Checkerboard[i][j + 1] == '.') ||
              (j > 0 && Checkerboard[i][j - 1] == '.'))) {
            //上下左右没有能走的了，就结束while循环
            break;
        }
        direction = rand() % DIREC;//余数0,1,2,3代表方向
        switch (direction) {
            case 0:
                if (i > 0 && Checkerboard[i - 1][j] == '.') {
                    Checkerboard[i - 1][j] = Letter[k];
                    k++;
                    i--;//上移
                }
                break;
            case 1:
                if (i < RAW - 1 && Checkerboard[i + 1][j] == '.') {
                    Checkerboard[i + 1][j] = Letter[k];
                    k++;
                    i++;//下移
                }
                break;
            case 2:
                if (j > 0 && Checkerboard[i][j - 1] == '.') {
                    Checkerboard[i][j - 1] = Letter[k];
                    k++;
                    j--;//左移
                }
                break;
            case 3:
                if (j < COL - 1 && Checkerboard[i][j + 1] == '.') {
                    Checkerboard[i][j + 1] = Letter[k];
                    k++;
                    j++;//右移
                }
                break;
        }
    }
    for (i = 0; i < RAW; i++) {
        for (j = 0; j < COL; j++)
            printf(" %c", Checkerboard[i][j]);
        printf("\n");
    }
    return 0;
}