include <stdio.h> include <string.h> int main(){ char str[5000];char* p=str;char* q=str;int a=1,b=0;int i;int head=1,rear=0; gets(str);//printf("%s\n",str); for(i=0;i<5000;i++) //定位字符数组的尾部{ if(str[i]=='\0') { rear=i; break; }} for(i=0;i<...