#ifndef REVERSE_STRING_H#define REVERSE_STRING_H #include<string> // #include<cstring>  will cause error! string   Reverse(string   str)   {     string   S;     int   n=str.size();     while(n>0)     {       n--;       S+=str[n];     }     return   S;   } string Convert(string str){  int n=str.size();  while(n>0)     {       n--;    if(str[n]>=65&&str[n]<=90) str[n]+=32;  //convert capital letter into small letter,in order to ignore the form     //str[n]=(str[n]>90? str[n]+32:str[n]);  }  return str;} string Ignore(string str){ int n=str.size(); string s; for(int i=0;i<n;i++) {  if((str[n]>=65&&str[n]<=90)||(str[n]>=97&&str[n]<=122))   s+=str[i]; } return s;} #endif       /////////////////////////////////////////////////////////// //main() #include<iostream>#include<fstream>using namespace std;#include "Reverse_string.h"    void main(){ string filename="Reverse_string.h",str; cin>>filename; ifstream infile(filename.c_str(),ios::in); // "filename.c_str()"  instead of "filename",right! if(!infile)  exit(1);  while(infile>>str){      //exit when press "Ctrl+Z" int len=str.size(); string s=Convert(Ignore(str)); if(Reverse(s)==s)  cout<<"True!"<<endl; else cout<<"False!"<<endl; }} /*把从文件中提取的长字符串以空格分开，然后分别存入vector中 vector<string> vs;while(str!=EOF){ infile>>str; vs.push_back(str);}*/

评论