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language-agnosticprocessor

How can I discover whether my CPU is 32 or 64 bits?

How do I find out if my processor is 32 bit or 64 bit (in your language of choice)? I want to know this for both Intel and AMD processors.

Solution

  • Windows, C/C++:

    #include <windows.h>

SYSTEM_INFO sysInfo, *lpInfo;
lpInfo = &sysInfo;
::GetSystemInfo(lpInfo);
switch (lpInfo->wProcessorArchitecture) {
case PROCESSOR_ARCHITECTURE_AMD64:
case PROCESSOR_ARCHITECTURE_IA64:
    // 64 bit
    break;
case PROCESSOR_ARCHITECTURE_INTEL:
    // 32 bit
    break;
case PROCESSOR_ARCHITECTURE_UNKNOWN:
default:
    // something else
    break;
}