What does || mean in C language?

The || operator in C language is a logical OR operator used to check the value of two expressions. If both expressions are true, the result is true, otherwise it is false. Its precedence is lower than the && (logical AND) operator, but higher than the ? : (ternary) operator. It can be used to check multiple conditions, set default values, and simplify conditional expressions.

The meaning of || in C language

In C language, the || operator is a logical OR Operator used to check the value of two expressions. Its function is as follows:

• If both expressions are true (non-zero), the result is true.
• If any expression is false (zero), the result is false.

Example

int a = 1;
int b = 0;

if (a || b) {
  // 此条件为真，因为 a 不为零。
}
else {
  // 此条件不会执行，因为至少 a 不为零。
}

Priority and associativity

|| operator has lower precedence than && (logical AND) operator, but above ? : (ternary) operator. It combines from left to right.

Uses

|| Operators can be used in a variety of ways, including:

• Checking whether multiple conditions are true:

  if ((a > 0) || (b < 0)) {
  // 如果 a 大于 0 或 b 小于 0，执行此代码。
  }

• Set the default value:

  int c = a || 10;
  // 如果 a 为真 (非零)，则 c 为 a，否则 c 为 10。

• Simplify the conditional expression:

  if (!a) {
  // 与 (a == 0) 等效。
  }

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