'！'之前的不合格身份证(unqualified

'！'之前的不合格身份证(unqualified-id before '!' token)

我正在尝试在arduino中编写一个布尔计算器。但我得到这个错误，我无法弄清楚是什么错误： unqualified-id before '!' token unqualified-id before '!' token突出显示第4行。这是我的代码：

#include <LiquidCrystal.h> LiquidCrystal lcd(2,3,4,5,6,7); byte verticalLine[8] = { // Custom character (vertical line), 5 X 7. 1 = pixel on, 0 = pixel off. B10000, B10000, B10000, B10000, B10000, B10000, B10000 }; boolean not(boolean X) { return !X; } boolean and(boolean A, boolean B) { if(A && B) return true; else return false; } boolean or(boolean A, boolean B) { if(A || B) return true; else return false; } boolean xor(boolean A, boolean B) { return or(and(not(A), B), and(A, not(B)); } void setup() { // put your setup code here, to run once: lcd.begin(16,2); lcd.print("Hello World!"); lcd.createChar(0, verticalLine); } void loop() { // put your main code here, to run repeatedly: lcd.setCursor(0, 1); //first character of second row. lcd.write(0); // writes my custom character. }

唯一的! 我看到的是not（）方法，这是一个问题吗？

编辑：我尝试将not（）方法更改为：

if(X) return false; else return true;

所以没有! 在我的代码中，但它仍然给出了这个错误。我甚至尝试在第3行删除分号，但它仍然会出现错误并突出显示第4行，这真的很奇怪......

谢谢。

i'm trying to write a boolean calculator in arduino. But I get this error and I can't figure out what's wrong: unqualified-id before '!' token It highlights the 4th line. Here's my code:

#include <LiquidCrystal.h> LiquidCrystal lcd(2,3,4,5,6,7); byte verticalLine[8] = { // Custom character (vertical line), 5 X 7. 1 = pixel on, 0 = pixel off. B10000, B10000, B10000, B10000, B10000, B10000, B10000 }; boolean not(boolean X) { return !X; } boolean and(boolean A, boolean B) { if(A && B) return true; else return false; } boolean or(boolean A, boolean B) { if(A || B) return true; else return false; } boolean xor(boolean A, boolean B) { return or(and(not(A), B), and(A, not(B)); } void setup() { // put your setup code here, to run once: lcd.begin(16,2); lcd.print("Hello World!"); lcd.createChar(0, verticalLine); } void loop() { // put your main code here, to run repeatedly: lcd.setCursor(0, 1); //first character of second row. lcd.write(0); // writes my custom character. }

The only ! I see is in the not() method, is it a problem?

EDIT: I tried changing the not() method to:

if(X) return false; else return true;

so there are no ! in my code, but it still gives that error. I even tried removing the semicolon in the 3rd line, but it still gives that error and highlights the 4th line, which is really weird...

Thanks.