What does (a,b) mean in C language?

(a, b) represents a comma expression in C language, which contains multiple expressions. It is evaluated from left to right, and the result is the value of the last expression. Uses include: assigning multiple variables, serving as function parameters, and controlling flow.

(a, b) The meaning of in C language

in C language , (a, b) represents a comma expression, which contains two or more expressions. Expressions are separated by commas and evaluated from left to right. The value of a comma expression is the value of the last expression.

Example:

<code class="c">int x = (a + b, c / d);</code>

In this example, (a b, c / d) is a comma expression. First a b is evaluated, then c / d. Finally, the value of x will be set to the value of c / d.

Application:

Comma expressions are often used:

• ##Assign multiple variables:

  <code class="c">int a, b;
  a = b = 10;</code>

• As function parameters:

  <code class="c">int sum(int a, int b) {
  return a + b;
  }</code>

• Control flow:

  <code class="c">if ((a > b) && (c < d)) {
  // 执行一些操作
  }</code>

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