这里我们将看到 ASCII NUL、ASCII 0 和 Numeric Literal 0。ASCII null 表示为 0x00，零表示为 0x30。 ASCII NUL 字符用于在 C 或 C++ 中表示字符串的结尾。当程序员使用“0”（字符 0）时，它被视为 0x30。这是一个十六进制数。十进制等效值是 48。要使用 ASCII NUL，我们必须提及“\0”而不是“0”。
char asciiNul = ‘\0’; int zero = 0; char zeroChar = ‘0’;
第一个是 ASCII NUL，第二个是数字 0，第三个是字符 0。
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