Compiler Warning (level 3) CS0675

 

Updated: July 20, 2015

System_CAPS_ICON_note.jpg Note

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Bitwise-or operator used on a sign-extended operand; consider casting to a smaller unsigned type first

The compiler implicitly widened and sign-extended a variable, and then used the resulting value in a bitwise OR operation. This can result in unexpected behavior.

The following sample generates CS0675:

// CS0675.cs  
// compile with: /W:3  
using System;  
  
public class sign  
{  
   public static void Main()  
   {  
      int hi = 1;  
      int lo = 1;  
      long value = (((long)hi) << 32) | lo;              // CS0675  
      // try the following line instead  
      // long value = (((long)hi) << 32) | ((uint)lo);   // correct  
   }  
}  

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