Bug with ! operator

ROOT
1

Please look at this:

void test()
{
  double x=1.2;
  if(!x) cout<<x<<endl;
}

Tested on version 5.10/00
I hope it is bug, not a feature :wink:

2

This is illegal in C++ (only valid for bool and int).
You should test

Rene

3

[quote=“brun”]This is illegal in C++ (only valid for bool and int).
You should test

   if (x != 0) ..

[/quote]

I think that is perfectly legal in C and therefore in C++ as well.

//  g++  notworks.cc -o notworks.exe

#include <iostream>
#include <iomanip>

using namespace std;

int main()
{
   double notzero = 2.1;
   double zero = 0.;
   if (notzero)
   {
      cout << "notzero is not zero" << endl;
   } else {
      cout << "Zut!" << endl;
   }
   if (! zero)
   {
      cout << "zero is zero" << endl;
   } else {
      cout << "not having a good day" << endl;
   }
}

The attached code compiles just fine with g++ and produces

cplager@PointyIII> ./notworks.exe 
notzero is not zero
zero is zero
cplager@PointyIII>

notworks.cpp (480 Bytes)

4

In the current version in CVS (thanks Axel) we have reactivated the code
allowing
if (!x)
when x is a float or double. This protection was introduced when compilers
did not support this feature (including gcc) on 64 bits platforms.
I checked that both gcc and vcc++ are OK on these platforms.

Rene