score:214

Accepted answer

hit ctrl+alt+del to open the windows task manager and switch to the processes tab.

32-bit programs should be marked with *32.

score:8

go to the eclipse base folder → open eclipse.ini → you will find the below line at line no 4:

plugins/org.eclipse.equinox.launcher.win32.win32.x86_64_1.1.200.v20150204-1316 plugins/org.eclipse.equinox.launcher.win32.win32.x86_1.1.200.v20120913-144807

as you can see, line 1 is of 64-bit eclipse. it contains x86_64 and line 2 is of 32-bit eclipse. it contains x_86.

for 32-bit eclipse only x86 will be present and for 64-bit eclipse x86_64 will be present.

score:23

in linux, run file on the eclipse executable, like this:

$ file /usr/bin/eclipse
eclipse: elf 64-bit lsb executable, x86-64, version 1 (sysv), dynamically linked (uses shared libs), for gnu/linux 2.4.0, not stripped

score:63

help -> about eclipse -> installation details -> tab configuration

look for -arch, and below it you'll see either x86_64 (meaning 64bit) or x86 (meaning 32bit).

score:150

open eclipse.ini in the installation directory, and observe the line with text:

plugins/org.eclipse.equinox.launcher.win32.win32.x86_64_1.0.200.v20090519 then it is 64 bit.

if it would be plugins/org.eclipse.equinox.launcher.win32.win32.x86_32_1.0.200.v20090519 then it is 32 bit.


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