What does 0‖0 mean in C language?

The bitwise OR operation (0‖0) performs a logical OR operation on the binary bits of two integers bit by bit, that is, if any bit is 1, the result is 1, otherwise it is 0. For example: 5 (0101) is bitwise ORed to 3 (0011) to get 7 (0111). This operation is useful for setting flags, extracting bits, comparing patterns, and performing masking operations.

0‖0 What does it mean in C language?

0‖0 means bitwise in C language OR operation. The bitwise OR operator (|) logically ORs each binary bit of two integers, that is, if either bit is 1, the resulting bit is 1; otherwise, the resulting bit is 0.

For example:

<code class="c">int a = 5; // 0101
int b = 3; // 0011
int result = a | b; // 0111</code>

In the bitwise OR operation, the binary bit 0101 of a and the binary bit 0011 of b perform the logical OR operation bit by bit:

• 0 | 0 = 0
• 1 | 0 = 1
• 0 | 1 = 1
• 1 | 1 = 1

Therefore, the result is 0111, converted to decimal 7.

Purpose

The bitwise OR operation has many applications in C language, including:

• Setting binary flags or bit fields
• Extract binary bits
• Compare binary patterns
• Perform bit mask operation

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