The difference between x-- and --x in c language

The postfix decrement operator x in C language--first returns the unmodified x value and then decrements it, while the prefix decrement operator--x first decrements the x value before assigning it to x .

x-- and --x in C language

In C language, x-- and- -x are both decrement operators, used to reduce the variable x by 1. The difference between them is the order of operator execution.

x-- (Suffix Decrement)

• This operator first assigns the value of variable x to a temporary variable.
• Then decrease the value of x by 1.
• Finally, return the value of the temporary variable.

--x (prefix decrement)

• This operator first decrements the value of x by 1.
• Then assign the decremented value to x.

Difference

So the main difference is that postfix decrement first returns the unmodified x value and then decrements it, whereas prefix decrement first decrements the x value, Then assign it to x.

Example

The following example shows the difference between x-- and --x:

<code class="c">int x = 5;
int y = x--; // y = 5, x = 4
int z = --x; // z = 3, x = 3</code>

Conclusion

• x-- Return the unmodified value of x before decrementing it.
• --x decrements the value of x before assigning it to x.

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