What does 0x55 mean in c++

0x55 is represented in C as the integer 85. The hexadecimal system represents numbers using symbols 0 through F, where A-F correspond to decimal 10-15. In C, hexadecimal numbers are represented by the "0x" prefix, such as 0x55. Hexadecimal numbers are commonly used to represent color values, memory addresses, and bit operations.

The meaning of 0x55 in C

#0x55 is a hexadecimal number, expressed in C as Integer 85.

Hexadecimal number

Hexadecimal is a base 16 number system. It uses 0 to F (16 symbols) to represent numbers. A, B, C, D, E, and F in the hexadecimal system correspond to 10, 11, 12, 13, 14, and 15 in the decimal system respectively.

Hexadecimal numbers in C

In C, you can use the prefix "0x" to represent hexadecimal numbers. For example, 0x55 is equivalent to the decimal number 85.

Application scenarios

Hexadecimal numbers are often used in C:

• represents color values ​​(for example, #FF0000 represents Red)
• represents the memory address
• Perform bit operations (for example, bitwise AND operation)

Example

<code class="cpp">int x = 0x55; // 十进制数 85
cout << x << endl; // 输出 85</code>

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