Qt错误iso c ++禁止比较指针和整数-fpermissive

Question

I use Qt 4.5.1 and here in this console application when I want to receive user's input at if statement line it gets this error:

iso c++ forbids comparison between pointer and integer -fpermissive

here's my code:

#include <cstdlib>
#include <iostream>
using namespace std;
int main(int argc, char *argv[])
{
   QCoreApplication a(argc, argv);
   char ans;
   QDir mDir;
   QString mPath("A:/inetpub/wwwroot/xampp");
   if (mDir.exists(mPath))
      qDebug() << mDir.exists();

   else {
      qDebug() << "Do you wanna create the path? Y / N";
      // getline(cin, ans);
      cin >> ans;
      if (ans == "y") {
        qDebug() << "Now I create one";
        mDir.mkpath(mPath);
       }
   }

   return a.exec();
}

I have another trivial separated question as well; why I can't use getline(cin,string) function this way in Qt?

Answer 1

You are comparing string literal with char

  if (ans == "y") 

Should be

  if (ans == 'y') 

Answering your second question. getline() is used to read a string or a line from input stream not single char . and the syntax goes as below.

istream& getline (istream& is, string& str);