以下程序的运行结果是________、___________、________、_________。#include #define P printf#define C2 "%c""%c""\n"#define S2 "%s""%s""\n"main(){static struct st{char c[5];char *s;} s1={"cake","milk"};static struct t{char *str;struct st ss1;} s2={"work",{"time","free"}};P(C2,s1.c[0],*s1.s);P(S2,s1.c,s1.s);P(S2,s2.str,s2.ss1.s);P(S2,++s2.str,s2.ss1.s+2);}