bit masking is very common on the lower level code.

#include <cstdio>

#include <algorithm>

#define MAXSIZE 205

char line[MAXSIZE];

int main() {

    //freopen("input.txt","r",stdin);

    int x,y, dir; // (dir&3) 0,1,2,3 -- right,up,left,down

    char *p;

    while(scanf("%s",line)!=EOF) {

        puts("300 420 moveto\n310 420 lineto");

        x=310, y=420, dir=0;

        for(p=line;*p;++p) {

            if(*p=='A') { --dir; }

            else { ++dir; }

            switch(dir&3) {

            case 0: x+=10; break;

            case 1: y+=10; break;

            case 2: x-=10; break;

            case 3: y-=10; break;

            }

            printf("%d %d lineto\n",x,y);

        }

        puts("stroke\nshowpage");

    }

    return 0;

}

版权声明：本文为博主原创文章，未经博主允许不得转载。// p.s. If in any way improment can be achieved, better performance or whatever, it will be well-appreciated to let me know, thanks in advance.