What does i-- mean in c++

The i-- operator in C performs a post-subtraction operation, first assigns the value of i to a temporary variable, subtracts 1 and then updates the value of i. This is different from the prepended subtraction operator (i--), which updates the value of i before subtracting 1.

The post-increment and decrement operations represented by i-- in C

i-- in C The operator represents a post-subtraction operation, which performs the following operations:

• First assign the value of i to a temporary variable.
• Update the value of i to a temporary value after subtracting 1.

For example:

<code class="cpp">int i = 5;
int j = i--; // j 为 5，i 为 4</code>

In the above example, after assigning the value of i to j, the value of i is decremented by 1. Therefore, the value of j is 5 and the value of i is 4.

The difference between the preceding subtraction operator (i--) and the preceding subtraction operator (i--)

The preceding subtraction operator (i--) will update i before subtracting 1 value, while i-- does the opposite.

For example:

<code class="cpp">int i = 5;
int j = --i; // j 为 4，i 为 4
int k = i--; // k 为 4，i 为 3</code>

In the above example, --i decrements the value of i by 1 before updating the value of i, so the value of j is 4. On the other hand, i-- is decremented by 1 after assigning the value of i to k, so the value of k is 4 and the value of i is 3.

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