The difference between i++ and ++i in c language

In C language, i and i are both auto-increment operators, and the order of execution is different: i reads the value of i first and then adds 1; i adds 1 first and then reads the value of i.

The difference between i and i in C language

Direct answer:
In C language, i and i are both increment operators, but the order of execution is different.

Detailed description:

i (increment later)

• Read the value of i into a temporary variable middle.
• Add 1 to the value of i.
• Store the value of i after adding 1 back to variable i.

i (front increment)

• Add 1 to the value of i.
• Store the value of i after adding 1 back to variable i.
• Read the value of i into a temporary variable.

Difference:
The main difference lies in the order of execution. i reads the value of i first and then increments it by 1, while i increments it by 1 and then reads the value of i.

Example:

<code class="c">int i = 0;
int j = i++; // j = 0, i = 1
int k = ++i; // k = 2, i = 2</code>

Usage scenario:

• i (last addition): Use when you need to use the value of i before modification, such as in a for loop.
• i (front increment): Use when the modified value of i needs to be used, such as in a conditional expression.

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