Write a Program in Python/C++ To Test That Computer is Booted With Legacy Boot ROM-BIOS or UEFI.

============ Python Program ============

import os

print 'UEFI detected.' if os.path.exists('/sys/firmware/efi') else 'Legacy BIOS detected.'

============ OUTPUT ============

# Legacy BIOS detected.

============ C++ Program ============

include windows.h
include iostream
using namespace std;

int main(){ 
        GetFirmwareEnvironmentVariable("", "{00000000-0000-0000-0000-000000000000}", NULL, 0);
        if (GetLastError() == ERROR_INVALID_FUNCTION) {
                cout << endl << "Legacy  BIOS detected.";
        } else{
                cout << endl << "UEFI detected.";
        }
        cin.get();
        return 0;

}

============ OUTPUT ============

# Legacy BIOS detected.

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** Note : Operating System Program.