题解 | #坐标移动#

#include <stdio.h>

typedef struct
{
    int x;
    int y;
}point_t;

static int isPointFlag(char c)
{
    if(c == 'A' || c == 'D'
      || c == 'W' || c == 'S')
    {
        return 1;
    }
    return 0;
}

static int isPoint(char c)
{
    if(c >= '0' && c <= '9')
    {
        return 1;
    }
    return 0;
}

int main()
{
    point_t point = {0};
    char str[10000] = {0};
    gets(str);
    char *p = str;
    char pointFlag = 0;  //查找到坐标方向标志
    int distance = 0;    //移动距离
    while(*p != '\0')
    {
    	//1、未匹配到方向
        if(!pointFlag)
        {
            //寻找坐标方向
            if(isPointFlag(*p))
            {
                pointFlag = *p;    //把方向赋值给pointFlag
                p++;
                //continue;
            }
            else
            {
                //匹配不到就继续匹配方向
                while(*p != '\0' && *p != ';')
                {
                    p++;
                }
            }
        }
            
        //2、匹配到方向，处理移动距离
        if(pointFlag)
        {
            if(isPoint(*p))
            {
                distance *= 10;
                distance += *p - '0';
            }
            else if(*p == ';')//表示距离的数字结束
            {
                switch(pointFlag)
                {
                    case 'A':
                        {
                            point.x -= distance;
                        }
                        break;
                    case 'D':
                        {
                            point.x += distance;
                        }
                        break;
                    case 'W':
                        {
                            point.y += distance;
                        }
                        break;
                    case 'S':
                        {
                            point.y -= distance;
                        }
                        break;
                    default:
                        printf("failed -->[%c]", pointFlag);
                        break;
                }
                distance = 0;
                pointFlag = 0;
            }
            else
            {
                //若出现问题，则清空数据
                distance = 0;
                pointFlag = 0;
            }
        }
        p++;
    }
    printf("%d,%d\n", point.x, point.y);
    return 0;
}