A TENS machine is small -- about the size of an iPad mini. It’s connected to a series of electrodes, which are put on your skin to deliver a low-voltage electrical charge. The electrical pulses ...
Healthline: Using a TENS Machine for Labor Pain: Is It For You? The Conversation: What’s a TENS machine? Can it help my period pain or endometriosis? What’s a TENS machine?
define tens machine, Can it help my period pain or endometriosis? As far as I know, what you're trying to do (use if statement and then return a value from a macro) isn't possible in ISO C... but it is somewhat possible with statement expressions (GNU extension). Since #define s are essentially just fancy text find-and-replace, you have to be really careful about how they're expanded. I've found that this works on gcc and clang by default: The Register-Guard: Why TENS Machine Manufactury for Medical Device Brands Is Growing Across Global Clinics Why TENS Machine Manufactury for Medical Device Brands Is Growing Across Global Clinics Even though researchers disagree on its effectiveness for lower back pain, they consider transcutaneous electrical nerve stimulation (TENS) safe with a low risk of complications.
