[Zume]

pawn Code:

public OnPlayerTakeDamage(playerid, issuerid, Float: amount, weaponid, bodypart)
{
    if(issuerid != INVALID_PLAYER_ID) 
    {
        new Float:_v;
        GetPlayerHealth(playerid, _v); // BEFORE
        printf("BEFORE: %.4f", _v);
        _v = _v-amount; // AFTER
        printf("AFTER: %.4f", _v);
    }
    return 1;
}