循环向后打印字符串

Question

程序要求用户输入一系列字符串（他们的名字和一个 8 个字母的单词），打印他们的名字，单词的前三个字母和最后三个字母，然后向后打印他们的单词。需要帮助 for 循环向后显示字符串。

    #include <iostream> 

int main () { 


string FirstName; 

string LastName; 

string MiddleName; 

string Names; 

string string1; 

int len; 

int x;  

 cout << "Hello. What is your first name?" << endl; 

 cin >> FirstName; 

 cout << FirstName  << ", what is your last name?" << endl; 

 cin >> LastName; 

 cout << "And your middle name?" << endl; 

 cin >> MiddleName; 

 Names = LastName + ", " + FirstName + ", " + MiddleName; 

 cout << Names << endl; 

 cout << "Please enter a word with 8 or more characters (no spaces): " << endl; 

 cin >> string1; 

 len = string1.length(); 

   if (len < 8){
     cout << "Error. Please enter a word with 8 or more characters and no spaces: " <<    endl; 

     cin >> string1; 
 }

  else if (len >= 8){

     cout << "The word you entered has " << string1.length() << " characters."<<endl; 

 cout << "The first three characters are " << string1.substr(0,3) << endl; 

 cout << "The last three characters are " <<string1.substr(string1.length()-3,3) << endl; 

x = string1.length()-1; 

for (x = string1.length()-1; x >=0; x--){
 cout << "Your word backwards: " << string1[x]; 
}
}



return 0; 
} 

Answer 1

你快到了：

cout << "Your word backwards: ";
for (x = string1.length()-1; x >=0; x--){
   cout << string1[x]; 
}

这样，循环将以string1相反的顺序打印每个字符，并且文本"Your word backwards: "仅打印一次。