PRB: Variable Scope in for-statement Extends Beyond Loop

 Last reviewed: July 24, 1997
Article ID: Q167748
The information in this article applies to:
  • The C/C++ Compiler (CL.EXE) included with: - Microsoft Visual C++, 32-bit Editions, version 5.0

SYMPTOMS

If you declare the same variable in two different for-statements, the following error may appear: 

   Test.cpp(4) : error C2374: 'i' : redefinition; multiple initialization

CAUSE

The scope of a variable declared in the initialization part of a "for" loop is given local scope, as if it had been declared immediately prior to the for-statement.

RESOLUTION

Compile with /Za, Disable Language Extensions. To select this option in Developer Studio, select Project, Settings, and then click the C/C++ Tab. Change the Category to Customize and select Disable Language Extensions.

MORE INFORMATION

   /* Compile Options Needed to compile without error: /Za */

    /* test.cpp */
    void main()  {
   for (int i=0; i<10; i++)
      ;
   for (int i=0; i<15; i++)
      ;
    }

Keywords : CPPLngIss
Version : 5.0
Platform : NT WINDOWS
Issue type : kbprb

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Last reviewed: July 24, 1997
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