What does the double vertical line symbol mean in C language

In C, the double vertical symbol (||) is a logical or operator that is used to find a OR value on two Boolean expressions: if either of the two expressions is true, the result is true. If both expressions are false, the result is false.

Double vertical line symbols in C language (||)

In C language, the double vertical line symbol (||) is a logical operator that represents logic or operation. Its meaning is as follows:

Function:

• Find logical or value for two Boolean expressions.
• If either of the two expressions is true, the result is true; otherwise, the result is false.

grammar:

 <code class="c">exp1 || exp2</code>

in:

• exp1 and exp2 are boolean expressions (i.e. return true or false values).

Evaluation:

The double vertical symbol follows the following evaluation rules:

1. Solve the expression exp1 in sequence from left to right.
2. If exp1 is true, the result is true and there is no need to solve exp2 .
3. If exp1 is false, then solve the expression exp2 .
4. If exp2 is true, the result is true; otherwise, the result is false.

Example:

 <code class="c">int main() { int a = 1, b = 0; if (a == 1 || b == 1) { printf("至少a 或b 为1\n"); } return 0; }</code>

Output:

<code>至少a 或b 为1</code>

In this example, a == 1 is true, so according to the evaluation rule of the double vertical symbol, there is no need to solve b == 1 and the conditional expression is true.

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