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AppInventor如何选相反数？ - App Inventor 2 中文网 - 清泛IT社区，为创新赋能！
问：AppInventor如何选相反数？
答：使用“数学”中的“相反数”积木：
返回给定数字的负数，若给定负数则返回正数。如：8 返回 -8，-0.7 返回 0.7，0 则仍然返回 0。
文档：https://www.fun123.cn/reference/blocks/math.html#neg
Java: parse int value from a char
...n be converted into int(0 to 9), e.g., '5'-'0' gives int 5.
String str = "123";
int a=str.charAt(1)-'0';
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How do I put a variable inside a string?
...('hanning{0}{1}{2}.pdf'.format(*nums))
Would result in the string hanning123.pdf. This can be done with any array.
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Converting from IEnumerable to List [duplicate]
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vcsjonesvcsjones
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App Inventor 2 AsciiConversion 拓展，ASCII编码与解码，Ascii码转换 · App Inventor 2 中文网
... 隐私策略和使用条款 技术支持 service@fun123.cn
App Inventor 2 实现商业级APP启动屏幕效果(SplashScreen) · App Inventor 2 中文网
... 隐私策略和使用条款 技术支持 service@fun123.cn
App Inventor 2 实现商业级APP启动屏幕效果(SplashScreen) - App应用开发 -...
...计时，立即跳到主界面：
源码下载见文档：https://www.fun123.cn/reference/pro/splash_screen.html
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ERROR 1130 (HY000): Host '' is not allowed to connect to this MySQL server [duplicate]
...>use mysql
mysql>GRANT ALL ON *.* to root@'%' IDENTIFIED BY 'redhat@123';
mysql>FLUSH PRIVILEGES;
mysql> SELECT host FROM mysql.user WHERE User = 'root';
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Can't connect to MySQL server error 111 [closed]
...rewall installed either. Ran out of ideas.
– CoderGuy123
Oct 14 '16 at 3:49
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