为什么将double赋值给int不会触发gcc警告？ [英] Why assignment of double to int does not trigger gcc warnings?

问题描述

  int i = 3.1 / 2 
  

不会导致任何警告，即使有-Wall选项。有时，我想知道在哪里精确度会丢失。为什么gcc不支持这个警告，而msvc支持这个？

谢谢。

编辑：我的gcc -v显示

配置为：../ ../gcc-4.4.1/configure --prefix = / mingw --build = mingw32 --enable-languages = c，ada，c ++，fortran，objc，obj-c ++ --disable -nls --disable-win32 -enable-cxx-flags =' - fno-function-sections -fno-data-sections'--disable-werror --enable-threads --disable-symvers --enable-version- specific-runtime-libs --enable-fully-dynamic-string --with-pkgversion ='TDM-2 mingw32'--enable-sjlj-exceptions --with-bugurl = http：//www.tdragon.net/recentgcc / bugs.php

解决方案

b

int i = 3.1 / 2

does not cause any warnings,even with -Wall option.Sometimes,I would like to know where precision lose.Why gcc does not support this warning,while msvc support this one?

thanks.

EDIT: my gcc -v shows

Configured with: ../../gcc-4.4.1/configure --prefix=/mingw --build=mingw32 --enable-languages=c,ada,c++,fortran,objc,obj-c++ --disable-nls --disable-win32-registry --enable-libgomp --enable-cxx-flags='-fno-function-sections -fno-data-sections' --disable-werror --enable-threads --disable-symvers --enable-version-specific-runtime-libs --enable-fully-dynamic-string --with-pkgversion='TDM-2 mingw32' --enable-sjlj-exceptions --with-bugurl=http://www.tdragon.net/recentgcc/bugs.php

解决方案

-Wconversion warns for implicit conversion.

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