相同的单词添加两次

Question

在C++中，我试图读取文件并将该文件中的字符串存储到程序中的字符串中。这很好，直到我得到最后一个字，总是存储两次。

ifstream inputStream; 
string next = ""; 
string allMsg = ""; 
inputStream.open(fileName.c_str()); 
string x; 

while (!inputStream.eof()) 
{ 
    inputStream >> x; 
    next = next + " " + x; 
} 
cout << "The entire message, unparsed, is: " << next << endl; 

这样做会增加最后一个字或int从我打开的文件到下一个。有什么建议么？谢谢！

Answer 1

这是因为当你读到最后一行，也不会置EOF位和故障位，只有当你阅读END，EOF位设置和eof()返回true。

while (!inputStream.eof()) // at the eof, but eof() is still false 
{ 
    inputStream >> x; // this fails and you are using the last x 
    next = next + " " + x; 
} 

将其更改为

while(inputStream >> x){ 
    // inputStream >> x; dont call this again! 
    next = next + " " + x; 
} 

Answer 2

while (!inputStream.eof()) 

应该

while (inputStream >> x) 

Answer 3

EOF（）如果最后读取命中文件的结尾，如果没有下一个读将达到文件的末尾将返回true。尝试：

ifstream inputStream; 
string next = ""; 
string allMsg = ""; 
inputStream.open(fileName.c_str()); 
string x; 

inputStream >> x; 
if(!inputStream.eof()) { 
    do { 
     next = next + " " + x; 
     inputStream >> x; 
    } while (!inputStream.eof()) 
} 
cout << "The entire message, unparsed, is: " << next << endl;