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C166 User's Guide
C166 Introduction 
Compiling Programs 
Environment Settings Command Prompt ERRORLEVEL Output Files Listing (LST) File Preprocessor (I) File Object (OBJ) File Source (SRC) File Directives Reference ASM ASMEXPAND BROWSE BYTEALIGN CODE COMMONRET COMPACT COND DEBUG DEFINE DISABLE DYNAMICUSRSTK EJECT ENDASM EXTINS EXTMAC FIX_BR03 FIX166 FIX167 FIX272 FIX32F FIXBFLD FIXMDU FIXPEC FIXROM FLOAT64 HCOMPACT HLARGE HOLD INCDIR INIT LARGE LISTINCLUDE MAC MEDIUM MOD167 MODV2 NOALIAS NOAMAKE NOASMEXPAND NOCOND NODPPSAVE NOEXTEND NOFIXDPP NOFRAME NOINIT NOOBJECT NOPRINT NOREORDER NOSAVEMAC OBJECT OPTIMIZE ORDER PACK PAGELENGTH PAGEWIDTH PECDEF PREPRINT PREPRINTONLY PRINT REENTRANT REGFILE RENAMECLASS REORDER RESTORE SAVE SAVEMAC SAVESYS SAVEUSR SMALL SRC STATIC SYMBOLS TABS TINY UNSIGNED_CHAR USERSTACKDPP3 WARNING WARNINGLEVEL XLARGE Language Extensions Preprocessor Advanced Programming Error Messages Library Reference AppendixFLOAT64 Compiler Directive
| Abbreviation | F64 |
| Arguments | None. |
| Default | 32-bit floating-point math is used. |
| µVision | Options — C166 — Double-precision Floating-point. |
| Description | The FLOAT64 directive enables 64-bit (double-precision) floating-point math for double variable types in your C programs. Variables of type float continue to use 32-bit floating-point math. By default, all floating-point math is performed using 32-bits (even when the double type is specified.) The FLOAT64 directive must be specified to use 64-bit floating-point math. |
| Example |
C166 SAMPLE.C FLOAT64
#pragma float64
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