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What does x-- mean in C language?

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Release: 2024-04-29 17:54:14
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In C language, x-- is a postfix decrement operator, which decreases the value of variable x by 1: 1. First evaluate the current value of x. 2. Decrement the value by 1 and store it back in x. 3. Return the new value of x after decrementing it.

What does x-- mean in C language?

x-- The meaning of

In C language, x-- is A postfix decrement operator that decrements the value of variable x by 1.

How it works

x-- works like this:

  • First, it evaluates the variable ## The current value of #x.
  • It then decrements the value by 1 and stores it back into the variable
  • x.
  • Finally, it returns the new value of
  • x after decrementing it.
It should be noted that the postfix decrement operator (

x--) is different from the prefix decrement operator (--x). The prefix decrement operator decrements the value of x by 1 before it is evaluated, while the prefix decrement operator decrements it by 1 after.

Example

The following code demonstrates the usage of

x--:

<code class="c">int x = 5;
printf("x 的初始值:%d\n", x); // 输出:5
x--;
printf("x 递减后:%d\n", x); // 输出:4</code>
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Notes

  • x-- is a postfix operator, so it must be placed after the variable.
  • x-- modifies the value of the variable x, so it should not be used with a pointer to x.

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