What does ‖ mean in C language?

The | symbol in C language represents the bitwise OR operator, which compares the binary bits of two operands. If a certain bit is 1, the result is 1, and if both are 0, the result is 0. Common uses include checking flag bits, setting flags, combining bit masks, and bit manipulation.

The meaning of | symbol in C language

In C language, the pipe symbol (|) represents bitwise OR operator. It compares the binary bits of two operands bit by bit and returns a result where each bit is the Boolean OR result of the corresponding bit in the operands having a value of 1.

How the bitwise OR operator works

• If both bits of the operands are 0, the result bits are also 0.
• If at least one bit of the operand is 1, the result bit is 1.

Example

int a = 5; // 二进制表示为 0101
int b = 3; // 二进制表示为 0011

int result = a | b; // 二进制表示为 0111

The resulting bits will be:

• First bit: 0, because the first bit in a and b All bits are 0.
• Second digit: 1, because the second digit in a is 1.
• The third digit: 1, because the third digit in a is 1.

Thus, the value of result will be 7, which is 0111 in binary representation.

Usage

The bitwise OR operator is used in a variety of scenarios, including:

• Checking flag bits (e.g., error flags)
• Set specific flag bits
• Combined bit mask
• Bit manipulation operations

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