What does x-- mean in C language?

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.

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.

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

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>

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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