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Important This document may not represent best practices for current development, links to downloads and other resources may no longer be valid. Current recommended version can be found here.

Compiler Warning (level 1) C4215

Error Message

nonstandard extension used : long float

The default Microsoft extensions (/Ze) treat long float as double. ANSI compatibility (/Za) does not. Use double to maintain compatibility.

The following sample generates C4215:

// C4215.cpp
// compile with: /W1 /LD
long float a;   // C4215

// use the line below to resolve the warning
// double a;

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