以下程序的运行结果是( ) #include "stdio.h" char* fun(char *s1,char *s2) { char *p=s2; while((*s1)!='\0') { *s2=*s1; s1++,s2++; } return p; } void main(void) { char *p,*strcpy; char *s1="world cup!"; char *s2="good luck!"; printf("s1=%s\ns2=%s\n",s1,s2); p=fun(s1,s2); printf("s1=%s\ns2=%s\n",s1,s2); }